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. 2019 Feb 19;10:138. doi: 10.3389/fpls.2019.00138

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Copyright © 2019 Arrillaga, Morcillo, Zanón, Lario, Segura and Sales.

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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Morphology of spiky (SK, up) and smooth (SM, down) maritime pine embryogenic lines and their appearance before (left) and after (right) 12 weeks in maturation medium.