ml138ML138 is a probe for MLPCN, an agonist of the κ opioid receptor. Popular Searches. Cell Counting Kit-8 (CCK-8) Approved Drug Library MG-132 Ferrostatin-1 Z-VAD-FMK. mole. 1Rollway® ML138 100 Cylindrical Round Bore Unmounted Radial Roller Bearing, 190 mm Dia Bore, 300 mm OD, 2 Rows, 46 mm W, 357907 N Dynamic525414 N Static Load