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Fig. 5. Fate of Notch1-activated cells in the endocardial lineages.
(A,B) Labeling of the heart (E10.5) in whole-mount (A) and after
dissection (B). Notch1 activity results in lacZ labeling
within the outflow tract (OFT, arrow) and the ventricles (not shown).
(C,D) Exclusive endocardial staining of the heart, the outflow
tract and the lining of the valves (arrowhead) at E14.5. Myocardial cells are
not stained. BA, branchiocephalic artery. (E,F)
N1::cre-labeled endocardial cells continuously receive a Notch1
signal (arrowheads) at E14.5, as shown by
-VLLS staining.
(G,H) In the adult heart, most endocardial cells retain label;
the endothelial lining of the valve and the arteries (H, arrows), where Notch1
is required, are also labeled. (I,J) Comparison of the
complementary staining patterns of endocardial cells (arrowhead) and
cardiomyocytes in (I) N1::cre and (J)
N1-/-;N1+/+;R26 lacZ chimeric
hearts, respectively. Note that Notch1 is not active in cardiomyocyte cells(I) and
also not required(J). Magnification: A, 16x; B, 50x; C,G,10x; E,F,40x; I,J 63x.