How are trypsinogen, trypsin and enterokinase related to each other and what role in digestion?

1) trypsinogen – a proenzyme produced by the pancreas, passing in the duodenum under the influence of intestinal juice enterkinase into trypsin
2) trypsin-enzyme, formed from trypsinogen under the action of enterokinase, in an alkaline environment breaks down proteins and polypeptides to amino acids
3) enterokinase – an enzyme that is produced by the glands of the mucous membrane of the small intestine, converts trypsinogen into trypsin

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