|Detection of Human ID1 by Western Blot. Western blot shows lysates of HepG2 human hepatocellular carcinoma cell line and MCF-7 human breast cancer cell line. Gels were loaded with 20 μg of cytoplasmic (Cyto) and 10 μg of nuclear extracts (Nuc). PVDF membrane was probed with 1 µg/mL Goat Anti-Human/Mouse ID1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4377) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF017). A specific band for ID1 was detected at approximately 25 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.|
|ID1 in BG01V Human Embryonic Stem Cells. ID1 was detected in immersion fixed BG01V human embryonic stem cells, undifferentiated (lower panel) and differentiated into neural progenitor cells (upper panel), using Goat Anti-Human/Mouse ID1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF4377) at 10 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Goat IgG Secondary Antibody (red; Catalog # NL001) and counterstained with DAPI (blue). Specific staining was localized to nuclei. View our protocol for Fluorescent ICC Staining of Cells on Coverslips.|
ID-1a is a negative regulator of helix-loop-helix (HLH) DNA binding proteins. ID-1a contains a HLH motif but no DNA binding motif, therefore, upon binding other HLH proteins, ID-1a acts a dominant negative regulator. ID-1a can be found in both cytoplasmic and nuclear cell fractions. Increased ID-1a expression is associated with cellular proliferation and cancer.
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