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. 2019 Jan 28;10:29. doi: 10.3389/fpls.2019.00029

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Copyright © 2019 Wang, Xu, Yan and Xu.

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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Proembryogenic mass (PEM) proliferation curves for different amounts of inoculum. (A) Proliferation rate curves (showing total fresh weight over time) for different inoculum amounts. (B) Proliferation coefficient curves (showing fresh weight of culture/fresh weight of inoculum) for different inoculum amounts. The diagonal line in (A) indicates the inflection point (between slow growth and logarithmic growth) in each curve.