MPO and colitis: Reductions in MPO activity have also been reported in DSS-colitis BALB/c mice administered soybean β-conglycinin (50 or 500 mg/kg for 28 days) [71] and transported tripeptide VPY (Val-Pro-Tyr, 2-week pretreatment of drinking water with 0.1 and 1 mg/mL) [76].