ML291 specifically activates the apoptotic arm of the cellular unfolded protein response ( UPR) EC₅₀ = 762 nM) with 105-fold selectivity over activation of the adaptive UPR pathway. ML291 induces apoptosis in wild-type mouse embryonic fibroblasts (MEFs), but not in CHOP KO MEFs.

ML291 specifically activates the apoptotic arm of the cellular unfolded protein response.

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