90. Which of the following posttranslational modifications is applied to produce active insulin
molecules in pancreatic β cells:
① Phosphorylation of Ser residues
② Glycosylation of Asn residues
③ Cleavage of a signal sequence
④ Proteolytic cleavage of internal sequences
⑤ Formation of disulfide bonds
(A) ③④⑤
(B) ②③④
(C) ②⑤
(D) ①②④⑤
(E) ①②③⑤
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