The morphogenesis of feathers
Mingke Yu, Ping Wu, Randall Widelitz, Cheng-Ming Chuong 2002 Nature v420 p308-312
In this article from the journal Nature, the authors examine the gene pathways that lead to the development of different feather types. The evolutionary status of feather types is also examined leading to the conclusion that the bilaterally symmetrical feathers found on Sinornithosaurus represent the primitive morphotype.
