Cross-sections of the developing breastbone from a chicken (left) and an emu (right) (IMAGE)

Kyushu University

Cross-sections of the developing breastbone from a chicken (left) and an emu (right)

Caption

Researchers at Kyushu University found that in both chickens and emus, TGF-β remains active until stage 34. In emus, it shuts off there, but in chickens, it continues for about two more days, through stage 36, giving the cells an extended work shift to keep dividing and push the keel downward.

Credit

Yuji Atsuta / Kyushu University

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