DCE-MRI was performed on pregnant mice of WT, Cdkn1a, p53, Cdkn2a and Cdkn2a;p53 genotypes on day E14.5. Mice were injected i.v. with an albumin-labeled contrast agent (biotin-BSA-GdDTPA; 10 mg/mouse) and placental enhancement was monitored at 9.4T MRI for 60 min. (D−G) Representative SI plots of Cdkn1a-/- (D), p53-/- (E), Cdkn2a-/- (F), and Cdkn2a-/-;p53-/- (G) placentas, compared to their WT or HET littermates. (H−I) Quantification of the SI Initial Enhancement (H) and SI Recovery (I) in WT, Cdkn1a-/-, p53-/-, Cdkn2a-/-, and Cdkn2a-/-;p53-/- placentas. MRI experiments were repeated at least three times for each murine genotype (n>=3 placental SI measurements from each genotype). Values are means +SEM; Statistical significance was determined by unpaired two-tailed Student's t-test (*) p < 0.05; (**) p < 0.01; (***) p < 0.001. 