"Presented as a Paleontological Society Short Course at the Annual Meeting of the Geological Society of America, Salt Lake City, Utah, October 19, 1997"--P. iv. Introduction to the Paleontological ...
Echinoderms such as starfish are unusual for their five-fold body symmetry. Maps of gene-expression patterns show how this body plan was acquired, and that the genes specifying head structures do the ...
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