Cleft of MHC Class I (H-2Kb + viral nonamer)

Backbone
    Alpha 1, Alpha 2,
    Disulfide bond.
   
   
   
show peptide backbone

Secondary structure backbone
    Alpha Helix,

    Beta Strand,

    Turn,
Other.
   
   
show spacefilled peptide,
          backbone atoms,

          sidechain atoms.