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Showing posts with the label Embryo

When a feather gene is disrupted, chickens exhibit dinosaur-like patterns.

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By Plos    When  the  sonic  hedgehog  (Shh)  pathway  is  inhibited  during  development,  the  resulting  feathers  are  unbranched  and  undeveloped,  much  like  the  feathers  of  primitive  protofeathers. Even  while  some  recovery  happens  after  hatching,  our  results  demonstrate  the  importance  of  Shh  signaling  for  feather  patterning  and  provide  strong  evidence   for  the  possibility  that  feathers  arose  from  simpler  skin  structures. Given  that  damaged  feather  follicles  can  revive  weeks  later,  the  study  also  suggests  that  biological  systems  are  resilient. Interrupting  ...