The invention provides isolated nucleic acids molecules, designated 26443 and 46873 nucleic acid molecules, which encode novel human hydrolase family members. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing 26443 and 46873 nucleic acid molecules, host cells into which the expression vectors have been introduced, and nonhuman transgenic animals in which a 26443 and 46873 gene has been introduced or disrupted. The invention still further provides isolated 26443 and 46873 proteins, fusion proteins, antigenic peptides and anti-26443 or 46873 antibodies. Diagnostic methods utilizing compositions of the invention are also provided.