 CD2 displays structural and functional similarities with "African swine fever virus" (ASFV) LMW8-DR, a protein that is involved in cell–cell adhesion and immune response modulation, suggesting
a possible role in the pathogenesis of ASFV infection.CD4 is the primary receptor for HIV-1.CD4 has four immunoglobulin-like domains in its extracellular region that share the same structure, but can differ in sequence.