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Description
Biochemistry 13 , 222245 (1974)

Parallel experiments on the guinea pig ileum confirmed that these peptides exerted strong opioid-like inhibitory effects on smooth muscle contractions, with relative potency trends similar to those observed in the behavioral assays

Mechanistically, permeation enhancement is typically achieved through transient modulation of epithelial tight junctions to increase paracellular transport, alteration of membrane organisation to facilitate transcellular diffusion, and may also influence local mucus-drug interactions or enzymatic stability depending on excipient chemistry and exposure profile (Maher et al., 2019)

Similar results were observed in the present study, although the underlying mechanisms remain to be identified
