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. 2014 Nov 13;15(1):137. doi: 10.1186/s12931-014-0137-7

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© Xu et al.; 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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Sampling age of different experimental group rats. Upward arrows represent sampling times, solid triangles represent the times of interventions, d1 represents 1 day after birth. OVA = ovalbumin; IP = intraperitoneal injections.