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SB431542 (SB) is an established small molecular inhibitor that specifically binds to the ATP binding domains of the activin receptor-like kinase receptors, ALK5, ALK4 and ALK7, and thus specifically inhibits Smad2/3 activation and blocks TGF-β signal transduction. SB maintains the undifferentiated state of mouse embryonic stem cells. However, the way of SB in maintaining the undifferentiated state...
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