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Fig. 8. A model describing the activation of Chordin. Briefly, signalling
by Xenopus Nodal-related proteins such as Xnr1 activates Smad2 and
Smad3. Smad3 induces expression of Xlim1 directly and Xlim1 and Smicl, perhaps
in a ternary complex with Smad3 (indicated by `?'), then induce expression of
Chordin.
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