This presumed 110 amino acid residue domain is found in multiple copies in MAP (MHC class II analogue protein) Swiss:Q9Z4J2 [1]. The protein has been found in a wide range of extracellular matrix proteins [1].

1: Staphylococcus aureus expresses a major histocompatibility complex class II analog. Jonsson K, McDevitt D, McGavin MH, Patti JM, Hook M; J Biol Chem 1995;270:21457-21460. PMID:7545162