|Reprinted with permission from Nature|
CKI produces complete secondary dorsal axes. Synthetic mRNA encoding CKI, mutant CKI (K > R), or Xwnt-8 was injected at the eight-cell stage into one ventral vegetal blastomere. Embryos injected with CKI or Xwnt-8, but not inactive CKI (K > R), developed complete secondary dorsal axes.
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