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Correlation coefficient, with 95% CI, of spiral artery (SA) diameter in systole, as quantified by B‐flow/STIC M‐mode ultrasonography, and percent of spiral artery remodeling (SAR) (i.e. the number of trophoblast‐invaded arteries divided by the total number of arteries counted), as quantified by immunohistochemical image analysis on day 60 of gestation, in three untreated and six SAR‐suppressed baboons. r = 0.67; slope = 0.029 (P < 0.05).
