This antibody detects NLRP1; human NLRP1 is a 1473 amino acid protein. NLRP1, a member of NALP CLR subfamily, has an N-terminal pyrin domain (PYD), followed by an NBD, LRR, and a C-terminal CARD domain. NLRP1 is a component of both the inflammasome and apoptosome, suggesting that NLRP1 has important roles in both inflammation and apoptosis. The N-terminal domain consists of transactivation, CARD, Pyrin or BIR domains, or in some cases is undefined. The CLR  family, also known as the NOD family, has its ancient roots in the plant kingdom and is related to the disease resistance (R) gene family that mediates plant immune responses.However, multiple splice variants encoding distinct NLRP1 isoforms with varying amino acid lengths have been described and thus the molecular weight detected may vary depending on the isoform(s) expressed.