Rat PPBP/CXCL7 ELISA Kit PicoKine® (96 Tests) . Quantitate Rat Ppbp in cell culture supernatants, serum and plasma (heparin, EDTA) . Sensitivity: 2pg/ml. The brand Picokine indicates this is a premium quality ELISA kit. Each Picokine kit delivers precise quantification, high sensitivity, and excellent reproducibility. Only our most reliable and effective kits qualify as Picokine, guaranteeing top-tier results for your assays.