ml138ML-138 OBSOLETE DO NOT USE 0524 ROLLWAY BEARING | Cylindrical Roller Bearings ML138 - OBS. ML-138 OBSOLETE DO NOT USE 0524 Buy on from BDI – BearingML138 (CID 44601470) is a hhly selective agonist at kappa opioid receptors (KOR) that potently activate G protein coupling but weakly interact with β arrestin2. ML138 is a hhly selective