Beta galactosidase small chain. This domain comprises the small chain of dimeric beta-galactosidases EC:3.2.1.23. This domain is also found in single chain beta-galactosidase.
Domain of unknown function(DUF4981). This family consists of uncharacterized proteins around 1000 residues in length and is mainly found in various Bacteroides species. The function of this protein is unknown.