pfam09191: CD4-extracel (this model, PSSM-Id:401221 is obsolete and has been replaced by 462712)
CD4, extracellular
Members of this family adopt an immunoglobulin-like beta-sandwich, with seven strands in 2 beta sheets, in a Greek key topology. They are predominantly found in the extracellular portion of CD4 proteins, where they enable interaction with major histocompatibility complex class II antigens.