Answer
Peptide contraction increases when AN-PEP is absent because other digestive enzymes are not capable of digesting protein-rich fragments of protein.
Work Step by Step
The artificial stomach mimic system treated with the AN-PEP enzyme show less peptide concentration because AN-PEP cleaves proline-rich peptides. Control has other stomach enzymes but not AN-PEP, which digest gluten to proline-rich peptides but not further. Thus these peptides build up under controlled conditions.
