Peptide B (bovine) compete with and mimic the effects of opiate drugs.Bovine: H-Phe-Ala-Glu-Pro-Leu-Pro-Ser-Glu-Glu-Glu-Gly-Glu-Ser-Tyr-Ser-Lys-Glu-Val-Pro-Glu-Met-Glu-Lys-Arg-Tyr-Gly-Gly-Phe-Met-Arg-Phe-OH or H-FAEPLPSEEEGESYSKEVPEMEKRYGGFMRF-OH