CES1P1 encodes the human gene, Carboxylesterase 1 pseudogene 1. It may also be known as: Putative inactive carboxylesterase 4; Inactive carboxylesterase 1 pseudogene 1; Placental carboxylesterase 3; PCE-3; CES1A2; CES1A3; CES4; CESR. The encoded protein has an amino acid length of 287 and a mass of 30.7 kDa. CES1P1 is a member of the Type-B carboxylesterase/lipase family. Homologs of this gene exist in other organisms, including: Chicken.