Complex sentence: In contrast to other neuropeptides studied in human skin, substance P-induced vasodilatation has been found to decline during continuous infusion, possibly suggesting an internalization of neurokinin-1 (NK1).
Split into simpler sentences: In contrast to other neuropeptides studied in human skin, substance P-induced vasodilatation has been found to decline during continuous infusion. This possibly suggest an internalization of neurokinin-1 (NK1).