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Fig. 4. gsc and Xnot complement inhibition of BMP signals to promote notochord formation. (A-C) Tadpoles injected ventrally with tBR and gsc RNA. (D-F) Embryos injected ventrally with tBR and Xnot RNA. (A,D) External views of injected tadpole. (B,E) Transverse sections through tadpole larvae. (C,F) Lateral views of cleared injected embryos after immunostaining with MZ15.