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March 25, 2013
Scanning electron microscope image of Lytechinus pictus [sea urchin] embryo at the 2-cell stage. Fertilization envelope has been removed to reveal the cells covered with a dense meshwork of the hyaline layer, in which microvilli are embedded. Class Echinoidea Superorder Echinacea OrderTemnopleuroida Lytechinus pictus JEOL 35C SEM Credit: Evelyn Spiegel, Louisa Howard

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