Anti-placenta specific 1 antibodies enable researchers to detect and measure the placenta specific 1 antigen in biological samples. This target is a reported synonym of the PLAC1 gene, which encodes placenta enriched 1. This protein is known to function in placenta development, among other biological roles. The human version of placenta specific 1 has a canonical amino acid length of 212 residues and a protein mass of 23.6 kilodaltons. It is reported to be a secreted protein that is notably expressed in the placenta. Other names for this target antigen include CT92, OOSP2B, and OOSP2L. A number of placenta specific 1 antibodies have been mentioned in research publications and have associated citations. ELISA is a widely used application for these antibodies. Western Blot and Immunohistochemistry are also common applications.