(a).

Chain	Type	Length in C α	C α index
Chain A	MHC	276	1–276
Chain B	β 2-microglobulin	99	277–375
Chain C	Peptide	9	376–384
Chain D	TCR, α-chain	201	385–585
Chain E	TCR, β-chain	241	586–826
Chain F	CD8 α 1	114	827–940
Chain G	CD8 α 2	114	941–1054