Fig. 2

Positive correlations between the cord plasma EPO ratios and placental EPO gene expression ratios. The cord plasma EPO ratio is plasma EPO concentration in the smaller (or the small-for-gestational-age) twin divided by the EPO concentration of the larger (or the appropriate-for-gestational-age) twin. The placental EPO gene expression ratios for the two placental territories in a twin pair are presented as fold changes between the two fetuses in MC twins: (relative EPO expression concentrations of the sIUGR twin) / (relative EPO expression concentrations of the AGA twin). Abbreviations: EPO: erythropoietin; MC: monochorionic; sIUGR: selective intrauterine growth restriction; AGA: appropriate for gestational age