CD45 Antibody (OX-1) - BSA Free


Flow Cytometry: CD45 Antibody (OX-1) [NB100-64895] - Analysis using Alexa Fluor (R) 488 conjugate of CD45 antibody (OX-1). Rat Splenocytes were stained with CD45 antibody (OX-1) [NB100-64895] (blue) and a matched more
Flow Cytometry: CD45 Antibody (OX-1) [NB100-64895] - Analysis using the FITC conjugate of CD45 antibody (OX-1). Staining of rat spleen cells.
Flow Cytometry: CD45 Antibody (OX-1) - BSA Free [NB100-64895] - Representative sequential gating during flow cytometry analysis of rat non-parenchymal liver cells (n = 4). Cells were labeled with antibodies to SE-1 more
Flow Cytometry: CD45 Antibody (OX-1) [NB100-64895] - Staining of rat peripheral blood lymphocytes with mouse anti-rat CD45 antibody (OX-1) [NB100-64895].

Product Details

Reactivity RtSpecies Glossary
Applications Flow, ICC/IF, IHC, CyTOF-ready
BSA Free
1.0 mg/ml

Order Details

CD45 Antibody (OX-1) - BSA Free Summary

This CD45 Antibody (OX-1) was prepared from A 100kD thymocyte glycoprotein fraction enriched for the rat leukocyte common antigen (L-CA).
Type I membrane protein.
Protein G purified
Innovator's Reward
Test in a species/application not listed above to receive a full credit towards a future purchase.


  • CyTOF-ready
  • Flow Cytometry 1:100
  • Immunocytochemistry/ Immunofluorescence 1:10-1:500
  • Immunohistochemistry 1:10-1:500
  • Immunohistochemistry-Frozen 1:10-1:500
Application Notes
The antibody is directed against L-CA (leukocyte common antigen), the rat equivalent of CD45 which has a molecular weight 180-240kDa, and is present on all rat leukocytes, but not erythroid cells or cells of other tissues. This antibody is CyTOF ready.
Theoretical MW
143 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
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NB100-64895 in the following applications:

Packaging, Storage & Formulations

Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.
0.02% Sodium Azide
1.0 mg/ml
Protein G purified

Alternate Names for CD45 Antibody (OX-1) - BSA Free

  • B220
  • CD_antigen: CD45
  • CD45 antigen
  • CD45
  • CD45R
  • EC
  • EC:
  • GP180
  • LCA
  • L-CA
  • Leukocyte common antigen
  • LY5
  • protein tyrosine phosphatase, receptor type, c polypeptide
  • receptor-type tyrosine-protein phosphatase C
  • T200 Glycoprotein
  • T200 leukocyte common antigen
  • T200


CD45, also known as leukocyte common antigen (LCA), T200, or Ly5, is a member C of the class 1 receptor-like protein tyrosine phosphatase (PTPRC) family (1, 2). It is a transmembrane glycoprotein which, due to alternative splicing, has a multiple isoforms with a theoretical molecular weight ranging from 180 - 220 kDa (1, 3-5). Human CD45 is synthesized as a 1281 amino acid sequence consisting of an alternatively spliced extracellular receptor-like region, a cysteine-rich domain, fibronectin-like III repeats, a transmembrane segment, and a cytoplasmic region with tandem protein tyrosine phosphatase (PTP) domains: the membrane proximal domain (D1) and the membrane distal domain (D2) (3, 5). CD45 is expressed on all nucleated hematopoietic cells and their precursors, except mature red blood cells, and is one of the most abundantly-expressed cell-surface glycoproteins, comprising approximately 10% of surface proteins in lymphocytes (3). Functionally, CD45 is essential for development and activation of T-cells and B-cells (1-5). More specifically, CD45 positively regulates antigen receptor signaling and Src-family member kinase activity (1, 3). There are many ways to regulate CD45 phosphatase activity including ligand binding, dimerization, protein interactions, cellular localization, and covalent modifications (3, 6). Ligands for CD45 include pUL11, a transmembrane protein of the cytomegalovirus RL11 (CMV RL11) family, and placental protein 14 (PP14), both of which exclusively bind CD45, and various lectins including CD22, galectin-1, galectin-3, macrophage mannose receptor (MR), and macrophage galactose-type lectin (MGL) (6).

Given its role in immune cell development and activation, CD45 has also been linked to a variety of diseases. The importance of CD45 in immunity has been revealed in human and mouse studies where CD45-deficiency leads to a severe-combined immunodeficiency (SCID) phenotype (2, 3, 6). A CD45-knockout mice study revealed inhibited thymocyte production and poor B-cell response, whereas CD45 activation in mice causes lymphoproliferation and autoantibody production (3). CD45 variants have been associated with altered immune function and autoimmune disorders including multiple sclerosis, systemic lupus erythematosus (SLE), and rheumatoid arthritis (6). Furthermore, altered CD45 expression has been implicated in oncological conditions including chronic lymphatic leukemia, acute lymphatic leukemia, Hodgkin lymphoma, multiple myeloma, and diffuse large B-cell lymphoma (6). Considering its role in autoimmune disorders, immunodeficiency and cancer, CD45 is an ideal therapeutic target (3, 6). The main approaches to control CD45 function is through either selective inhibitors or anti-CD45 antibodies (3).

Alternative names for CD45 includes B220, CD antigen: CD45, CD45 antigen, CD45R, EC, GP180, LCA, Leukocyte common antigen, LY5, protein tyrosine phosphatase receptor type c polypeptide, PTPRC, receptor-type tyrosine-protein phosphatase C, T200 Glycoprotein, and T200.


1. Trowbridge, I. S., & Thomas, M. L. (1994). CD45: an emerging role as a protein tyrosine phosphatase required for lymphocyte activation and development. Annual review of immunology.

2. Andersen, J. N., Jansen, P. G., Echwald, S. M., Mortensen, O. H., Fukada, T., Del Vecchio, R., Tonks, N. K., & Moller, N. P. (2004). A genomic perspective on protein tyrosine phosphatases: gene structure, pseudogenes, and genetic disease linkage. FASEB journal : official publication of the Federation of American Societies for Experimental Biology.

3. Hermiston, M. L., Xu, Z., & Weiss, A. (2003). CD45: a critical regulator of signaling thresholds in immune cells. Annual review of immunology.

4. Tonks, N. K., Diltz, C. D., & Fischer, E. H. (1990). CD45, an integral membrane protein tyrosine phosphatase. Characterization of enzyme activity. The Journal of biological chemistry.

5. Nam, H. J., Poy, F., Saito, H., & Frederick, C. A. (2005). Structural basis for the function and regulation of the receptor protein tyrosine phosphatase CD45. The Journal of experimental medicine.

6. Rheinlander, A., Schraven, B., & Bommhardt, U. (2018). CD45 in human physiology and clinical medicine. Immunology letters.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Publications for CD45 Antibody (NB100-64895)(22)

We have publications tested in 3 confirmed species: Human, Rat, C. elegans.

We have publications tested in 5 applications: FLOW, IF/IHC, IHC-Fr, IHC-P, WB.

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Showing Publications 1 - 10 of 22. Show All 22 Publications.
Publications using NB100-64895 Applications Species
Han N, Su Y, Guo M, Yu L Retinal SHP2 silencing alleviates diabetic retinopathy via suppressing inflammatory response and oxidative stress by regulating YAP1 activity Experimental animals 2022-04-08 [PMID: 35400714] (IHC-P, Rat) IHC-P Rat
Tigges J, Eggerbauer F, Worek F Et al. Optimization of long-term cold storage of rat precision cut lung slices (PCLS) with a tissue preservation solution American journal of physiology. Lung cellular and molecular physiology 2021-10-13 [PMID: 34643087] (FLOW, Rat) FLOW Rat
Bhandari, S, Li, R Et al. Transcriptome and proteome profiling reveal complementary scavenger and immune features of rat liver sinusoidal endothelial cells and liver macrophages. BMC Mol Cell Biol 2020-11-27 [PMID: 33246411] (IF/IHC, Human) IF/IHC Human
Mironets E, Fischer R, Bracchi-Ricard V et al. Attenuating neurogenic sympathetic hyperreflexia robustly improves antibacterial immunity after chronic spinal cord injury J. Neurosci. 2019-11-21 [PMID: 31754014] (IF/IHC) IF/IHC
Liu, C Y, Yin, G Et al. Effect of exosomes from adipose-derived stem cells on the apoptosis of Schwann cells in peripheral nerve injury. CNS Neurosci Ther 2020-02-01 [PMID: 31278850] (WB, C. elegans) WB C. elegans
Majerova Petra, Michalicova Alena, Cente Martin et al. Trafficking of immune cells across the blood-brain barrier is modulated by neurofibrillary pathology in tauopathies. PloS One 2019-05-23 [PMID: 31120951] (IHC-Fr, Rat) IHC-Fr Rat
Wirtz MR, Jurgens J, Zuurbier CJ et al. Washing or filtering of blood products does not improve outcome in a rat model of trauma and multiple transfusion. Transfusion. 2018-11-21 [PMID: 30461025] (FLOW, Rat) FLOW Rat
Hersant B, Bouhassira J, SidAhmed-Mezi M, Vidal L. Should platelet-rich plasma be activated in fat grafts? An animal study. J Plast Reconstr Aesthet Surg. 2018-02-02 [PMID: 29477267] (IF/IHC, Rat) IF/IHC Rat
Stumbles PA, Thomas JA et al. Resting respiratory tract dendritic cells preferentially stimulate T helper cell type 2 (Th2) responses and require obligatory cytokine signals for induction of Th1 immunity. J Exp Med. [PMID: 9841916] (FLOW, Rat) FLOW Rat
Crook K, Hunt SV. Enrichment of early fetal-liver hemopoietic stem cells of the rat using monoclonal antibodies against the transferrin receptor, Thy-1, and MRC-OX82. Dev Immunol. [PMID: 8924759] (FLOW, Rat) FLOW Rat
Show All 22 Publications.

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Product General Protocols

Find general support by application which include: protocols, troubleshooting, illustrated assays, videos and webinars.

Video Protocols

ICC/IF Video Protocol

FAQs for CD45 Antibody (NB100-64895). (Showing 1 - 5 of 5 FAQs).

  1. We would like to order a CD45 antibody to stain immune cells that were isolated from a ligated sciatic nerve of mice with double immunofluorescence (using PFA-fixed tissue on slides). Which of the following rat monoclonal CD45 antibodies would you recommend: 30-F11, IBL-3/16 or 5C16?
    • I would recommend clone 30-F11. As clone IBL-3/16 has not yet been validated for IHC-P application, we would not be able to guarantee its workability on PFA-fixed tissue. Although both other clones i.e. 30-F11 and 5C16, would be good for your samples, CD45 30-F11 # NB100-77417 is a well known clone that offers more flexibility around protocol because of availability of its conjugated forms. It would be advantageous to use a conjugated primary as you are planning for double-immunostaining procedure.
  2. For use in Western Blot with CD45 antibodies, what molecular weight of the band should I expect to see?
    • The theoretical molecular weight for most of our CD45 antibodies is 147 kDa based off the first isoform. Any variation on 147 is due to the immunogen being from a different species and the protein being a slightly different size. CD45 is a family of single chain transmembraneous glycoproteins consisting of at least four isoforms (220, 205, 190, 180 kDa) which share a common large intracellular domain. Their extracellular domains are heavily glycosylated.
  3. If this product is used in an application or species as a part of a customer review, will that validate this product in the application/species?
    • If any of our primary antibodes are used in an untested application or species and it is shown to work through images from customer reviews or through publications, this validates the application/species for this product, allowing the tested application/species to fall under our 100% guarantee. Please check out our Innovator's Reward Program if you decide to test a primary antibody with a species or application that is not currently listed. Please note that the Innovator's Reward Program only applies to our primary antibodies.
  4. Is CD45 a good target for use in Neurodegeneration studies?
    • Yes, here are the approved research areas we have listed for our CD45 products: Adaptive Immunity, Cell Biology, Cellular Markers, Cytokine Research, Glia Markers, Hematopoietic Stem Cell Markers, Immunology, Innate Immunity, Mast Cell Markers, Mesenchymal Stem Cell Markers, Microglia Markers, Myeloid Cell Markers, Myeloid-derived Suppressor, Neurodegeneration, Neuroscience, Signal Transduction, Stem Cell Markers, Growth and Development.
  5. I have a question about 2 of your products namely, NB100-65361 and NB100-64895, both antibodies against CD45 in rat. We would like to identify CD45 cells in paraffin fixated tissue slides, however in both datasheets of both antibodies it states that the antibodies can be used for immunohistochemistry and immunohistochemistry-Frozen. What exactly do you mean with the first immunohistochemistry? Do these antibodies also work on paraffin sections? If so, what exactly is the difference between the 2 antibodies and which one would you suggest for our purpose?
    • I am sorry for the confusion on our datasheet with the listing of IHC and IHC-Fr. These two products have only been validated in frozen tissue samples. We list IHC as well to enable easy searching on our website of antibodies that have been testing in this type of experiment. As neither of these products have been tested in paraffin-embedded tissue samples, you would qualify for our Innovator's Reward program. In exchange for a review using one of these products in your experiment, we would issue you a credit for the purchase price of the antibody. The main difference between the two antibodies is that they are made to different monoclonal clones. NB100-65361 is sold as 1.0ml of unpurified mouse tissue culture supernatant. NB100-64895 is 0.25mg of protein G purified mouse monoclonal antibody.

Secondary Antibodies


Isotype Controls

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Research Areas for CD45 Antibody (NB100-64895)

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Blogs on CD45.

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How To Identify B Cell Subsets Using Flow Cytometry
By Victoria OsinskiUsing Flow Cytometry to Identify B Cell SubsetsIdentifying cellular subsets by flow cytometry requires careful and thorough planning in order to ensure the correct subset of cells are identified...  Read full blog post.

You complete me: Natural killer cells need TGF-beta inhibition to effectively combat cancers
By Jamshed Arslan Pharm.D. Natural killer (NK) cells are lymphocytes of the innate immune system that were first discovered for their “natural” ability to kill cancer cells. To use NK cells as anti-cancer therapy, t...  Read full blog post.

The application of CD31/Pecam-1 (MEC 7.46) in breast cancer research
CD31/PECAM-1, or platelet endothelial cell adhesion molecule 1, is a 130-kDa glycoprotein expressed on vascular and hematopoietic cells.  Depending on the cell type, CD31/PECAM-1 expression can be largely localized to cell junctions, playing a rol...  Read full blog post.

CD45 - Much more than just a housekeeping protein
CD45, also known as T200 or the Leukocyte Common Antigen (LCA), is encoded by the Protein Tyrosine Phosphatase Receptor type C (PTPRC) gene. The protein is expressed exclusively on cells of the haematopoietic system, and is one of the most abundant le...  Read full blog post.

CD45 Isoforms: Hematopoietic Differentiation, Cancer and Alzheimer's
CD45, also known as protein tyrosine phosphatase, receptor type, C (PTPRC), was originally known as common leukocyte antigen and is a signal transducer involved in many physiological processes such as growth and differentiation, cancer transformation,...  Read full blog post.

Vimentin Antibodies in Rheumatoid Arthritis & Cataracts Research
Vimentin is a 57kDa type III intermediate filament (IF) protein that is the major cytoskeletal component of mesenchymal cells and the first to be expressed during cell differentiation. It plays a significant role in supporting and anchoring the positi...  Read full blog post.

Antibodies In The Differential Diagnosis Of Undifferentiated Tumors
Immunohistochemical testing using antibody panels has a valuable role in cancer diagnosis. Some tumors, especially more malignant ones, tend to lose the appearance of the tissue of origin. However, knowing the tissue of origin assists the physician in...  Read full blog post.

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Gene Symbol PTPRC