Haag, E. S. and Raff, R. A. (1998). Isolation and characterization of three mRNAs enriched in embryos of the direct-developing sea urchin Heliocidaris erythrogramma: evolution of larval ectoderm. Dev. Genes Evol. Jun; 208(4): 188-204 Medline abstract
Haag, E. S., Sly, B. J., Andrews, M. E. and Raff, R. A. (1999). Apextrin, a novel extracellular protein associated with larval ectoderm evolution in Heliocidaris erythrogramma. Dev. Biol. Jul 1; 211(1) :77-87
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