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Neurulation

Because of the modularity of developmental processes, homologous morphological structures can be produced through divergence pathways. As West-Eberhard notes: "comparative development can be used to trace homology, but developmental differences do not negate it" (p. 496). Image from p. 495 of Mary Jane West-Eberhard (2003) Developmental Plasticity and Evolution, Oxford University Press:Oxford. 794 p.