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. 2015 Mar 17;16(1):203. doi: 10.1186/s12864-015-1420-9

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© Dong et al.; licensee BioMed Central. 2015

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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Characteristics of sericins. a. Phylogenetic tree of sericin homologs based on maximum likelihood method with bootstrap replicates set as 1000. Numbers near branches indicate the bootstrap values for the given clades. The red dots at internal nodes denote where gene duplication events have occurred, supported with bootstrap value >75. b. Evolutionary events of the sericin genes. Numbers of gene duplication (shown in green after “+”) and loss (shown in red after “-”) events were inferred for each internal node as well as for the seven species. Red box represents Ser-1 and Ser-3 homologs and blue box denote Ser-2 homologs. c. Amino acid composition of Ser-1 and Ser-3 homologs. d. Amino acid composition of Ser-2 homologs.