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. 2020 Aug 4;11:1815. doi: 10.3389/fmicb.2020.01815

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Copyright © 2020 Burns, Kerney and Duhamel.

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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Typical stage 33 A. maculatum embryo from these experiments. (A) Single egg capsule containing stage 33 embryo. Green hue is from intracapsular algae. (B) Decapsulated stage 33 embryo. Scale bar: 1 mm.