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Xbra and Xgsc transcription is activated by HA-HA SMAD2 as effectively as by untagged SMAD2. Each embryo was injected with the indicated dose of untagged, HA-HA, or Myc6 Smad2 mRNA. Animal caps at stage 10.5 were analyzed by RNase protection. WE, whole embryo. The results shown are representative of three independent experiments.
