Provided below are ELISA kits targeting estrogen receptor binding site associated antigen 9, a human protein encoded by EBAG9. This protein is 213 amino acids long with a reported mass of 24.4 kDa. 2 isoforms have been identified. Other alias names for this protein include: receptor-binding cancer antigen expressed on SiSo cells, cancer-associated surface antigen RCAS1, estrogen receptor-binding fragment-associated gene 9 protein, and EB9.