(A) A nitrogen (N1) of the biotin molecule
(B) Sulphur of thiophene ring
(C) α-Amino group of lysine
(D) α-Amino group of protein
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(A) A nitrogen (N1) of the biotin molecule
(B) Sulphur of thiophene ring
(C) α-Amino group of lysine
(D) α-Amino group of protein