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by Muller, proposed that the ammocoete endostyle has extremely similar functions as the tunicate hypobranchial groove. Numerous investigations into the endostyle ensued, only for the theory to be denied by future researchers. However, during this research, it was found that ammocoete endostyles can accumulate radioactive iodine isotopes. This revived academic interest in the endostyle. Already in 1963, research had concluded that cephalochordate and tunicate endostyles have

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