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Mutation in the ABL kinase domain is the principal mechanism of imatinib resistance in patients with chronic myelogenous leukaemia. The second generation BCR/ABL inhibitors nilotinib and dasatinib effectively inhibit most imatinib resistance variants, but are ineffective against the gatekeeper mutant, T315I. Gatekeeper mutation activates the kinase by stabilizing the hydrophobic spine. Here, we describe...