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. 2012 Sep 27;7(9):e45294. doi: 10.1371/journal.pone.0045294

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© 2012 Pisaneschi 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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NO₂ (A, B) and NOHb (C, D) in umbilical vein and artery blood. NT: twin with normal growth; ST: twin with restricted growth. Note that points for each set of twins are connected by a line. *p<0.05; **p<0.01 vs. normal twin.