Members of this family are found in a set of mucosal cellular adhesion proteins and adopt an immunoglobulin-like beta-sandwich structure, with seven strands arranged in two beta-sheets in a Greek-key topology. They are essential for recruitment of lymphocytes to specific tissues [1].

1: A reassessment of the MAdCAM-1 structure and its role in integrin recognition. Dando J, Wilkinson KW, Ortlepp S, King DJ, Brady RL; Acta Crystallogr D Biol Crystallogr. 2002;58:233-241. PMID:11807247