[1.] See Alex T. Kalinka et al., "Gene expression divergence recapitulates the developmental hourglass model," Nature, Vol. 468: 811-814 (December 9, 2010); Brian K. Hall, "Phylotypic stage or phantom: is there a highly conserved embryonic stage in vertebrates?," Trends in Ecology and Evolution, Vol. 12: 461-463 (December, 1997); Andres Collazo, "Developmental Variation, Homology, and the Pharyngula Stage,"Systematic Biology, Vol. 49:3 (2000).
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