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. 2015 Jul 27;10(7):e0134181. doi: 10.1371/journal.pone.0134181

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© 2015 Kawashima 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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Fig 4 — Scatter plots show the correlations between the serum cotinine levels and the ratio of PlGF gene expressions (A) and the ratio of PlGF protein expressions (B) in invasive trophoblasts during oxygenation compared with normoxia conditions. The significance was calculated according to Spearman’s correlation.