(A) Cysteine and Threonine
(B) Cysteine and Serine
(C) Methionine and Cysteine
(D) Methionine and Serine
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(A) Cysteine and Threonine
(B) Cysteine and Serine
(C) Methionine and Cysteine
(D) Methionine and Serine