Indirubins inhibit glycogen synthase kinase-3β and CDK5/p25, two protein kinases involved in abnormal tau phosphorylation in Alzheimer’s disease. A property common to most cyclin-dependent kinase inhibitors? - Leclerc,S.; Garnier,M.; Hoessel,R.; Marko,D.; Bibb,J.A.; Snyder,G.L.; Greengard,P.; Biernat,J.; Wu,Y.Z.; Mandelkow,E.M.; Eisenbrand,G.; Meijer,L. (Journal of Biological Chemistry, 2001)