The formation of mature insulin by proteolysis of the precursor preproinsulin. The signal sequence is first cleaved from preproinsulin to form proinsulin; proinsulin is then cleaved to release the C peptide, leaving the A and B chains of mature insulin linked by disulfide bridges. [ISBN:0198506732]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process