FAP and cervical cancer: Specific activity of Gly-Pro-p-nitroanilide hydrolysis in absence (control) and in presence of sitagliptin phosphate 2mM, a DPPIV/CD26 inhibitor, and NEM 5mM, a DP-8 and -9 inhibitor, in the cell monolayer of keratinocytes and cervical cancer cell lines.