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. 2014 Nov 25;14:238. doi: 10.1186/s12862-014-0238-4

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© Gallie and Liu; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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A class III gene first appears in vascular plants. RRMs (green), PABC domain (blue), RNP1 and RNP2 motifs (lines), and introns (vertical white bars) are indicated for the single PABP gene of C. reinhardtii, the two genes of K. flaccidum, the four progenitor PABP genes of P. patens, and the four genes of S. moellendorffii. A. thaliana PAB7 (At2g36660) is included for comparison. Ancestral introns are indicated with red asterisks. Introns unique to class I/II progenitor PABP genes or class III (PAB7-like) genes are indicated with blue or green asterisks, respectively.