After photoisomerization of the retinal molecule, which amino acid residue becomes a proton acceptor of the donor proton from the retinal molecule?

After photoisomerization of the retinal molecule, which amino acid res

1.	After photoisomerization of the retinal molecule, which amino acid residue becomes a proton acceptor of the donor proton from the retinal molecule?
A.	Met69
B.	Ala93
C.	Lys216
D.	Asp85
Answer» E.