Fig. 1
From: Evidence against tetrapod-wide digit identities and for a limited frame shift in bird wings
Pentadactyl amniote limbs have disparate patterns of genetic differentiation of digits. a Photographs of right forelimbs at the stages sampled, dorsal perspective. Analyses of limb patterning genes show that in b mouse and c alligator, replicates of each digit form clusters, indicating that the digits have distinct gene expression profiles. By contrast, d Anolis digits do not show clear differentiation of gene expression profiles. Alligator illustration reproduced with permission by Michael Richardson. Anolis illustration by Sarah Werning without modification (license [https://creativecommons.org/licenses/by/3.0/])
