Gene expression divergence recapitulates the developmental hourglass model

  title={Gene expression divergence recapitulates the developmental hourglass model},
  author={Alex T. Kalinka and Karolina M. Varga and Dave T. Gerrard and Stephan Preibisch and David L. Corcoran and Julia Jarrells and Uwe Ohler and Casey M. Bergman and Pavel Tomançak},
The observation that animal morphology tends to be conserved during the embryonic phylotypic period (a period of maximal similarity between the species within each animal phylum) led to the proposition that embryogenesis diverges more extensively early and late than in the middle, known as the hourglass model. This pattern of conservation is thought to reflect a major constraint on the evolution of animal body plans. Despite a wealth of morphological data confirming that there is often… CONTINUE READING
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