These growth regulation by estrogen in breast cancer 1 ELISA kits are immunodetection tools for measuring specific protein levels in biological samples. growth regulation by estrogen in breast cancer 1 is an alias of the human GREB1 gene, which encodes the protein, growth regulating estrogen receptor binding 1. The protein is believed to play a role in estrogen-stimulated cell proliferation. The GREB1 protein is 1949 amino acid residues in length and 216.5 kilodaltons in mass. However, as many as 4 protein isoforms have been identified. It is localized to the membrane of the cell. In terms of tissue specificity, it is reported to be expressed in proliferating prostatic tissue and prostate cancer. Other names for this target antigen include protein GREB1, gene regulated by estrogen in breast cancer, and gene regulated in breast cancer 1 protein. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.