17a-OH-Progesterone figure 14-9 Pathways and anatomical compartmentalization of the production of the C-21 progestins, particularly progesterone, 17a-hydroxyprogesterone, and 16a;-hydroxyproges-terone in the human fetal placental unit. This figure was derived in part from Buster, J. E., and Marshall, J. R. (1979). Conception, gamete and ovum transport, implantation, fetal placental hormones, hormonal preparation for parturition and parturition control. In "Endocrinology" (L. J. DeGroot, G. F. Cahill, L. Martini, D. H. Nelson, W. D. Odell, J. T. Potts, E. Steinberger, and A. I. Winegrad, eds.), Vol. 3, pp. 1595-1612. Grune & Stratton, New York.


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