File:Hilfer1990 Fig08.jpg
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Figure 8. Conklin (1905) early cleavage stages of the tunicate
Diagrams of early cleavage stages of the tunicate, Cynthia partita, from Conklin (1905). The four cells at the bottom of the upper left figure are traced through succeeding cleavages into a series of blastomeres that give rise to segmental muscles and other mesodermal derivatives. This is an example of the painstaking care that was needed to trace regionalization of egg cytoplasm through development.
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