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. 2021 May 11;12:672433. doi: 10.3389/fgene.2021.672433

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Copyright © 2021 Le Roy, Stapane, Gautron and Hincke.

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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Number of genomes sequenced in birds and reptiles, and the proteins identified in eggshell of different avian species. (A) Increase in number of bird and reptile genomes available in NCBI (upper: https://www.ncbi.nlm.nih.gov/), and Ensembl (lower: http://www.ensembl.org/index.html) databases since the chicken genome assembly in 2004. (B) Number of identified proteins using proteomics (upper) and non-proteomics (lower) approaches. Data were compiled from Hincke et al. (1995, 1999), Panheleux et al. (1999b), Gautron et al. (2001, 2007),Mann et al. (2006), Mann and Mann (2013, 2015), Mann (2015), Marie et al. (2015a), Zhu et al. (2019), and Le Roy et al. (2019).