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. 2013 Aug 19;8(8):e71629. doi: 10.1371/journal.pone.0071629

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© 2013 Grundy et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Principal component analysis of the micro-array data sets for paired blood (red circles) and pulmonary (blue circles) COPD CD8 cells (n = 6) and pulmonary smoker CD8 cells (Blue triangles, n = 6) was performed. Principal components 1 and 2 are charted accounting for 62.5% of all variation.