(a) Fold change in ACTH secretion (mean ± SEM) after CRH, AVP, or CRH + AVP administration in NCR after C-TOX treatment. Light gray, hypoxemia. #P < 0.05, CRH + AVP vs. CRH or AVP alone. (b) Fold change in ACTH secretion (mean ± SEM) after CRH, AVP, or CRH + AVP administration in CR groups after C-TOX treatment. Medium gray, maternal carunclectomy; dark gray, hypoxemia and maternal carunclectomy.