<p> This entry consists of proteins of unknown function, typically from 180 to 230 amino acids in length. These proteins are predicted to be aspartic peptidases belong to MEROPS clan AA [<cite idref="PUB00053567"/>]. This entry describes the well-conserved 121-residue C-terminal region. The poorly conserved, variable length N-terminal region usually contains a predicted transmembrane helix. </p>