Interdigital webbing retention in bat wings illustrates genetic changes underlying amniote limb diversification.
Weatherbee SD, Behringer RR, Rasweiler JJ, Niswander LA. Interdigital webbing retention in bat wings illustrates genetic changes underlying amniote limb diversification. Proc Natl Acad Sci U S A. 2006 Oct 10; 103(41):15103-7.