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 ...
Echinoderm research and diversity in Latin America / Juan José Alvarado and Francisco Alonso Solís-Marín -- The echinoderms of Mexico : biodiversity, distribution and current state of knowledge / ...
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