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. 2018 Sep 20;9:407. doi: 10.3389/fgene.2018.00407

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Copyright © 2018 Johnson.

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) Percentage of genes expressed in the chloroplast of Arabidopsis thaliana that are not found in non-photosynthesizing metazoans. (B) Percentage of genes with GO term ‘chitin metabolism’ that are lineage specific to arthropods or highly conserved across the tree of life.