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. 2008 Apr 25;9(1):36. doi: 10.1186/1465-9921-9-36

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Copyright © 2008 Allen et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Distribution of T cell frequencies among PPD negative, sarcoidosis and PPD+ subjects. The horizontal bars represent the 25^th, 50^thand 75^thpercentile respectively. There was a lack of recognition of sodA peptides among the majority of the PPD- control group, and a significant difference overall among the three groups. Among the sarcoidosis subjects, the distribution of the T cell frequencies among the sarcoidosis subjects more closely paralleled that of the PPD positive subjects also, rather than the PPD negative healthy volunteers.