396-HB) for five minutes to induce tyrosine phosphorylation of ErbB3. Serial dilutions of lysates were analyzed by R&D Systems’ Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769) and by IP-Western blot (inset). For IP-Westerns, IPs were done using anti-ErbB3 monoclonal antibody and anti-mouse IgG agarose. Immunoblots were incubated with biotinylated anti-phosphotyrosine monoclonal antibody (Cat #
BAM1676) to detect phospho-ErbB3. Bands were visualized with Streptavidin-HRP (Cat #
DY998) followed by ECL detection. ErbB3 was observed at its predicted size (inset; 185 kDa, arrow) in Western blot analysis." class="big_lightbox">

396-HB) for five minutes to induce tyrosine phosphorylation of ErbB3. Serial dilutions of lysates were analyzed by R&D Systems’ Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769) and by IP-Western blot (inset). For IP-Westerns, IPs were done using anti-ErbB3 monoclonal antibody and anti-mouse IgG agarose. Immunoblots were incubated with biotinylated anti-phosphotyrosine monoclonal antibody (Cat #
BAM1676) to detect phospho-ErbB3. Bands were visualized with Streptavidin-HRP (Cat #
DY998) followed by ECL detection. ErbB3 was observed at its predicted size (inset; 185 kDa, arrow) in Western blot analysis." alt="The human breast cancer cell line, MDA-MB-453, was treated with 100 ng/mL recombinant HRG-beta 1 (Catalog #
396-HB) for five minutes to induce tyrosine phosphorylation of ErbB3. Serial dilutions of lysates were analyzed by R&D Systems’ Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769) and by IP-Western blot (inset). For IP-Westerns, IPs were done using anti-ErbB3 monoclonal antibody and anti-mouse IgG agarose. Immunoblots were incubated with biotinylated anti-phosphotyrosine monoclonal antibody (Cat #
BAM1676) to detect phospho-ErbB3. Bands were visualized with Streptavidin-HRP (Cat #
DY998) followed by ECL detection. ErbB3 was observed at its predicted size (inset; 185 kDa, arrow) in Western blot analysis." class="big_thumb" />
396-HB) for five minutes. Cell lysates (100 μg) were analyzed by R&D Systems’ Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769) and by IP-Western blot (inset). IP-Western blots for phospho-ErbB3 (p-ErbB3) were done as described in Figure 1. Blots were stripped and total ErbB3 (ErbB3) was detected using biotinylated anti-ErbB3 polyclonal antibody (Catalog #
BAF234). " class="big_lightbox">

396-HB) for five minutes. Cell lysates (100 μg) were analyzed by R&D Systems’ Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769) and by IP-Western blot (inset). IP-Western blots for phospho-ErbB3 (p-ErbB3) were done as described in Figure 1. Blots were stripped and total ErbB3 (ErbB3) was detected using biotinylated anti-ErbB3 polyclonal antibody (Catalog #
BAF234). " class="big_thumb" />
396-HB) for five minutes. The indicated amounts of ErbB3 (Catalog # 348-ER), ErbB2 (Catalog #
1129-ER) or EGF R (Catalog #
1095-ER) recombinant extracellular domains were added to 5 μg lysate and analyzed using R&D Systems’ Human Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769). Competition was observed only with recombinant ErbB3. " class="big_lightbox">

396-HB) for five minutes. The indicated amounts of ErbB3 (Catalog # 348-ER), ErbB2 (Catalog #
1129-ER) or EGF R (Catalog #
1095-ER) recombinant extracellular domains were added to 5 μg lysate and analyzed using R&D Systems’ Human Phospho-ErbB3 DuoSet IC ELISA (Catalog # DYC1769). Competition was observed only with recombinant ErbB3. " class="big_thumb" />