Phospholipase A(1) (PLA(1)) is an enzyme that hydrolyzes phospholipids and produces 2-acyl-lysophospholipids and fatty acids and is conserved in a wide range of organisms. Hypotrichosis, or woolly hair with or without hypotrichosis hypotrichosis (deficiency of hair growth), can be caused by homozygous or compound heterozygous mutation in the LIPH (human-LIPH) gene on chromosome 3q27 (not hepatic lipase: human-LIPC). Other mammalian enzymes that exhibit PLA(1) activity in vitro are hepatic lipase HL endothelial lipase EL and pancreatic lipase-related protein 2 PLRP2 and belong to alpha/beta hydrolase superfamily.