FIGURE 2. Comparative analysis of CaM expression in finches.
From the following article:
The calmodulin pathway and evolution of elongated beak morphology in Darwin's finches
Arhat Abzhanov, Winston P. Kuo, Christine Hartmann, B. Rosemary Grant, Peter R. Grant and Clifford J. Tabin
Nature 442, 563-567(3 August 2006)
doi:10.1038/nature04843
a, b, Geospiza group species displaying distinct beak morphologies form a monophyletic group. c, The differences in beak morphology are skeletal. d, CaM is expressed in a strong distal–ventral domain in the mesenchyme of the upper beak prominence of the large cactus finch, G. conirostris, somewhat lower levels in cactus finch, G. scandens, and at significantly lower levels in the large ground finch and medium ground finch, G. magnirostris and G. fortis, respectively. Very low levels of CaM were detected in the mesenchyme of G. difficilis, G. fuliginosa and the basal warbler finch Certhidea olivacea. CaM expression domains are indicated with short arrows in d. Scale bar, 1 mm in b. The molecular tree is from ref. 23; images of skulls are from ref. 6, with permission from the author.
