MHC Class I

Backbone   Labeled
    Antigenic Peptide,
    Alpha 1,
    Alpha 2,
    Alpha 3,
    Beta2 Microglobulin,
    Disulfide bonds,
    Papain cleavage locus.

CD8 Binding Site (white)

Spacefill.

Alpha Helix,
    Beta Strand,

    Turn,
Other.

Beta2 Contact Atoms (3.3 Angstroms)
    CPK:  
     
Alpha chain contact atoms large,
      Beta chain small.