Pilb is an alias for the gene, Methionine sulfoxide reductase B2, in humans. Other names include: Methionine-R-sulfoxide reductase B2, mitochondrial; MsrB2; CBS-1; CBS1; CGI-131; MSRB; PILB. The encoded protein is an enzyme with an amino acid length of 182 and a mass of 19.5 kDa. Other isoforms may exist. Pilb is a member of the MsrB Met sulfoxide reductase family. This gene shares homology with other species, including: E. coli.