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from Part I - Frogs
Published online by Cambridge University Press: 26 February 2021
The abnormal animal featured here is a tadpole with two heads. In order to explain how it got that way, the chapter desccribes how the axes of the body are established in the embryo. This leads to a discussion of axes in conjoined twins and symmetry planes in various parts of the body, plus a three-eyed frog.
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