Fig. 13: The HPLC tracings of substance P degraded by human DPPIV and partially purified membrane fraction from carcass adhering cells. den. = denatured by boiling for 10 min. The dipeptide products were not resolved (control dipeptides ran with the solvent front). → Control substrate; ⇒ Cleaved product; ↓ between solvent front peaks. Both membrane fraction and the human enzyme gave unexplained noise around the smaller peptide peaks.