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. 2021 Aug 18;9:700860. doi: 10.3389/fcell.2021.700860

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Copyright © 2021 Sugahara, Pascual-Anaya, Kuraku, Kuratani and Murakami.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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An evolutionary scenario for the vertebrate cerebellum, based on Chaplin et al. (2010) and Butts et al. (2014c) and the present study. Note that the internal migration of postmitotic granule cells has been observed in teleosts but not in the paddlefish. Therefore, it is equally possible that this migration of granule cells was acquired after the divergence of chondrichthyans and osteichthyans, with paddlefish losing this ability secondarily. Alternatively, it is possible that teleosts acquired the migration independently from amniotes. val, valvula cerebelli; EGL, external granule cell layer.