Radioautographic Labeling in Placentas and Fetal Palatal Shelves After Maternal Injections of Tritiated Cortisone in A/Jax Mice

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Abstract
Tritiated cortisone was injected into pregnant A/Jax mice after a loading dose of cortisone on day 12 of pregnancy. Radioautographic studies of 160 placentas and fetal palatal shelves revealed: (1) significant labeling in all placental and fetal palatal tissue; (2) a variation in degree of labeling of fetal palates from different mothers; (3) no variation of degree of labeling in proximal or distal fetuses; and (4) a positive correlation in the degree of labeling in corresponding placentas and shelves.