The invention provides isolated nucleic acids molecules, designated 16002 nucleic acid molecules. The invention also provides antisense nucleic acid molecules, recombinant expression vectors containing 16002 nucleic acid molecules, host cells into which the expression vectors have been introduced, and nonhuman transgenic animals in which a 16002 gene has been introduced or disrupted. The invention still further provides isolated 16002 proteins, fusion proteins, antigenic peptides and anti-16002 antibodies. Diagnostic and therapeutic methods utilizing compositions of the invention are also provided.