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. 2013 Dec 16;4:286. doi: 10.3389/fgene.2013.00286

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Copyright © 2013 Su, Ling, Yu, Wu and Xiao.

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) or licensor 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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Domain number distribution of small proteins in NCBI genpept. SP usually contains a single domain. The NCBI genpept database contains 14,324,397 proteins, including 1,796,324 (12.54%) SPs. Only 310,909 (17.31%) SPs, about 2.17% of total proteins, are annotated, and among the annotated domain SPs, most of them (85.26%) have only one domain.