pfam09191: CD4-extracel (This model is not part of the current CDD release)
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.
Jiyao W et al.(2023). "The conserved domain database in 2023.",