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. 2013 May 17;8(5):e63372. doi: 10.1371/journal.pone.0063372

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© 2013 Longo 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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Sterols were analyzed by GC-MS and abundance was normalized to the stigmasterol (internal standard). A, Comparison of brassicasterol amounts, the most the most abundant sterol detected. B, Cholesterol uptake from plasma by Pb3 and Pb18 isolates. C, Comparison of sterols found in trace amounts in cell wall samples.