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Passive ID of PAs (A), ID of MCAs (B), WT of PAs (C), WT of MCAs (D), OD of PAs (E), and OD of MCAs (F) against intraluminal pressure from vehicle- or relaxin-treated NP rats. Relaxin significantly increased ID, WT, and OD at all pressures in PAs, but had no effect on the structure of MCAs. *P < 0.05 vs. vehicle controls.
