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. 2019 Aug 2;10:1773. doi: 10.3389/fmicb.2019.01773

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Copyright © 2019 Chen, Liu, Ren, Xi, Yang, Sun, Yu, Ying, Ouyang, Liu and Chen.

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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(A) L-threonine production by E. coli W1688-fimH^* in continuous immobilized fermentation. (B) Comparison of L-threonine productivities in continuous (repeated batch) immobilized fermentation with those in free-cell fermentation.