“If Walter Garstang's suggestion is correct, and chordates did arise from a tunicate-like form by retaining the chordate features of their larval stage of development into adulthood, then the first chordates must have been affected by a regulatory mutation that kept the Manx gene activated for a longer period of time.”

p, 125
Sudden Origins: Fossils, Genes, and the Emergence of Species (1999)

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Jeffrey H. Schwartz25

American anthropologist 1948

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