Anti-PRIMA antibodies enable researchers to detect and measure the PRIMA antigen in biological samples. This target is a reported synonym of the PRIMA1 gene, which encodes proline rich membrane anchor 1. This protein is known to be required to anchor acetylcholinesterase (ACHE) to the basal lamina of the neuromuscular junction and to the membrane of neuronal synapses in brain. The human version of PRIMA has a canonical amino acid length of 153 residues and a protein mass of 16.7 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the cell membrane of cells and notably expressed in many tissues, such as the endometrium, urinary bladder, and bronchus.