1Department of Biochemistry and Microbiology, Nelson Mandela Metropolitan University, P.O. Box 77000, Port Elizabeth 6031, South Africa.
2Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, 2193, South Africa.
Abbreviations: S2238, H-D-phenylalanyl-L-pipecolyl-p-nitroanilide dihydrochloride; DMSO, dimethyl sulfoxide; PVPP, polyvinylpolypyrrolidone; BSA, bovine serum albumin; DMEM, Dulbecco’s Modified Eagles Medium; FBS, fetal bovine serum; MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide; IC50, 50% inhibition.
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