
IndraLab
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"The precise steps responsible for activating Notch1 in the venous beds of mutant mice require further study, but we note that Dll4 itself can exert long-distant effects following its release into exosomes and that ADAM 17 (up-regulated more than 2-fold in Snail1 KO ECs) can activate Notch1 signaling in a ligand independent fashion XREF_BIBR, XREF_BIBR."