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. 2006 Feb 2;34(2):697–708. doi: 10.1093/nar/gkj470

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© The Author 2006. Published by Oxford University Press. All rights reserved

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Reorientation of A2660 base (highlighted). Original anti conformation is in the upper left corner, the alternative syn conformation in the upper right corner, intermediates in the base-flipping process are below.