Ki67/MKI67 Antibody


Orthogonal Strategies: Immunohistochemistry-Paraffin: Ki67/MKI67 Antibody [NBP2-54656] - Analysis in human bone marrow and skeletal muscle tissues. Corresponding MKI67 RNA-seq data are presented for the same more
Immunocytochemistry/ Immunofluorescence: Ki67/MKI67 Antibody [NBP2-54656] - Staining of human cell line A-431 shows localization to nucleus & nucleoli. Antibody staining is shown in green.
Immunohistochemistry-Paraffin: Ki67/MKI67 Antibody [NBP2-54656] - Staining of human bone marrow shows strong nuclear positivity in hematopoietic cells.
Immunohistochemistry-Paraffin: Ki67/MKI67 Antibody [NBP2-54656] - Staining of human small intestine shows moderate to strong nuclear positivity in glandular cells.
Immunohistochemistry-Paraffin: Ki67/MKI67 Antibody [NBP2-54656] - Staining of human skin shows moderate to string nuclear positivity in a subset of keratinocytes.
Immunohistochemistry-Paraffin: Ki67/MKI67 Antibody [NBP2-54656] - Staining of human lymph node shows moderate to strong nuclear positivity in germinal center cells.
Immunohistochemistry-Paraffin: Ki67/MKI67 Antibody [NBP2-54656] - Staining of human skeletal muscle shows no positivity in myocytes as expected.

Product Details

Reactivity HuSpecies Glossary
Applications ICC/IF, IHC, IHC-P
Validated by:

Orthogonal Strategies


Order Details

Ki67/MKI67 Antibody Summary

Immunogen affinity purified
Innovator's Reward
Test in a species/application not listed above to receive a full credit towards a future purchase.


  • Immunocytochemistry/Immunofluorescence 0.25-2 ug/ml
  • Immunohistochemistry 1:200 - 1:500
  • Immunohistochemistry-Paraffin 1:200 - 1:500
Application Notes
For IHC-P, HIER pH 6 retrieval is recommended. ICC/IF Fixation Permeabilization: Use PFA/Triton X-100.
Theoretical MW
359 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.
Control Peptide
Ki67/MKI67 Recombinant Protein Antigen (NBP2-54656PEP)

Packaging, Storage & Formulations

Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.
PBS (pH 7.2) and 40% Glycerol
0.02% Sodium Azide
Immunogen affinity purified

Alternate Names for Ki67/MKI67 Antibody

  • antigen identified by monoclonal Ki-67
  • Antigen Ki67
  • antigen KI-67
  • Ki67
  • Ki-67
  • KIA
  • Marker Of Proliferation Ki-67
  • MIB-
  • MIB-1
  • MKI67
  • PPP1R105
  • Proliferation Marker Protein Ki-67
  • proliferation-related Ki-67 antigen
  • Protein Phosphatase 1
  • Regulatory Subunit 105
  • TSG126


Ki67 is a nuclear protein associated with proliferation, named after its discovery in a Hodgkin's lymphoma-derived cell line by Scholzer and Gerdes at Kiel University, Germany (1). This proliferation marker is expressed during active phases of the cell cycle (late G1, S, G2 and M), whereas the protein remains undetectable in the G0 phase. Ki67 has two main isoforms with theoretical molecular weights of 319 kDa and 359 kDa. Its abundance is tightly regulated by synthesis and degradation with an estimated half-life of 60-90 min, regardless of its position in the cell cycle. Ki67 has been shown to be involved in ribosomal biogenesis, heterochromatin maintenance, and mitotic chromosome separation (2).

Detection of Ki67 by immunostaining is commonly used as a proliferation marker in solid tumors, as well as certain hematological malignancies (3-5). The Ki67 index, which reports on positive Ki67 stained tumor cell nuclei, has been extensively studied as a prognostic biomarker in cancers such as breast cancer and cervical cancer.


1. Gerdes J, Schwab U, Lemke H, Stein H. (1983) Production of a mouse monoclonal antibody reactive with a human nuclear antigen associated with cell proliferation. Int J Cancer. 31:13-20. PMID: 6339421

2. Starborg M, Gell K, Brundell E and Hoog C. (1996) The murine Ki-67 cell proliferation antigen accumulates in the nucleolar and heterochromatic regions of interphase cells and at the periphery of the mitotic chromosomes in a process essential for cell cycle progression. J Cell Sci. 109:143-153. 1996

3. Karamitopoulou E, Perentes E, Tolnay M, Probst A. (1998) Prognostic significance of MIB-1, p53, and bcl-2 immunoreactivity in meningiomas. Hum Pathol. 29(2):140-5. PMID: 9490273

4. Geyer FC, Rodrigues DN, Weigelt B and Reis-Filho JS. (2012) Molecular classification of estrogen receptor-positive/luminal breast cancers. Adv Anat Pathol. 19(1):39-53. PMID: 22156833

5. Ikenberg H, Bergeron C, Schmidt D, Griesser H, Alameda F, Angeloni C, Bogers J, Dachez R, Denton K, Hariri J, Keller T, von Knebel Doeberitz M, Neumann HH, Puig-Tintore LM, Sideri M, Rehm S, Ridder R; PALMS Study Group. (2013) Screening for cervical cancer precursors with p16/Ki-67 dual-stained cytology: results of the PALMS study. J Natl Cancer Inst. 105(20):1550-7. PMID: 24096620


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.

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Product General Protocols

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Video Protocols

ICC/IF Video Protocol

FAQs for Ki67/MKI67 Antibody (NBP2-54656). (Showing 1 - 1 of 1 FAQ).

  1. Is there a clone number for this Ki67 antibody?
    • This antibody is polyclonal, and thus it does not have a clone number.

Secondary Antibodies


Isotype Controls

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Blogs on Ki67/MKI67.

The relationship between Ki67 and HIF-1 in cancer
Ki67, also known as MKI67, is best known as the leading marker of cellular proliferation. Ki67 is regulated by a balance between synthesis and degradation, and often carries a very short half-life.  First discovered to be located to dividing cells,...  Read full blog post.

Ki67 - an established marker for labelling proliferating cells
Ki-67/MKI67 is an antigen which is expressed during G1, S, G2, and M phases of the cell cycle (mitotically active cells), but not during G0 phase (resting cells). It is a large protein with expected molecular weight of about 395 kDa, and it has a v...  Read full blog post.

Ki67 - A Crucial Cellular Proliferation Marker
The Ki67 antigen is a prototypic cell cycle-related protein expressed by proliferating cells in all phases of the active cell cycle (G1, S, G2 and M). It is a non-histone nuclear protein originally identified in a Hodgkin's lymphoma-derived cell line....  Read full blog post.

The Ki67 Antibody in Cell Marker Studies
The MK167, or Ki67 antibody recognizes a nuclear protein encoded by the MK167 gene. Ki167 is involved with RNA transcription and essential to cellular proliferation, being expressed by proliferating cells at all stages of the active cell cycle; it is ...  Read full blog post.

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Gene Symbol MKI67