Topical Terminology > Proinsulin
Proinsulin
For Proinsulin we have a term and definition in Diabetes.
Proinsulin (Diabetes) 
The initial protein made by the beta cells of the pancreas that later is broken into several pieces. Proinsulin consists of three parts: C-Peptide and two long strands of amino acids (called the alpha and beta chains) that later become linked together to form the insulin molecule.From every molecule of proinsulin, one molecule of insulin plus one molecule of C-Peptide are produced.(It may be noted that commercial production of exogenous insulin purifies the original insulin, and removes any residual proinsulin and C-Peptide that might have been initially present.)
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