Anti-H12.3 antibodies enable researchers to detect and measure the H12.3 antigen in biological samples. This target is a reported synonym of the RACK1 gene, which encodes receptor for activated C kinase 1. This protein is known to function in the apoptotic pathway and the cell cycle, among other biological roles. The human version of H12.3 has a canonical amino acid length of 317 residues and a protein mass of 35.1 kilodaltons. It is reported to be localized in the cell membrane, nucleus, and cytoplasm of cells. Other names for this target antigen include GNB2L1, Gnb2-rs1, and H12.3.