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Quick Overview

CHIR99021 is the most selective inhibitor of glycogen synthase kinase 3β (GSK3β). CHIR99021 does not show cross-reactivity against cyclin-dependent kinases (CDKs) with a 350 fold selectivity toward GSK3β compared to CDKs with a Kᵢ of <10nM in vitro. CHIR99021 has been shown in long term expansion of murine embryonic stem cells in conjunction with MEK/MAPK inhibitor PD184352 and fibroblast growth factor receptor (FGFR) inhibitor SU5402.