Biochem/physiol Actions AC-55649 is a subtype selective RAR (RARβ2) agonist. AC-55649 is a potent, orally available isoform selective Retinoic Acid Receptor β2. AC-55649 has high selectivity, 99% for RARβ2 and 31% for RARβ1. When compared to the gold standard AM-580 (Cat. No A8843), both isoform receptors were 100%. AC-55649 has a potent EC50 of 6.9 μM compared to an EC50 of 7.7 μM for AM-580. |