Hemizygotes and homozygotes are viable, fertile, normal in size, and do not display any gross physical or behavioral abnormalities. In the differentiated endothelium transgene expression is observed as early as E7.5 and progresses to almost full penetrance by E14.5. In adult mice, uniform cre expression is observed in the endothelium of developing and quiescent vessels of all organs examined, as well as within a subset of hematopoietic cells. When bred with any mouse containing a loxP-flanked sequence of interest, Cre-mediated recombination will result in deletion of the flanked genome. These mice may be useful in studies of the cardiovascular system, including angiogenesis, and endothelial and hematopoietic cell lineages. Cre activity is seen in 20%-40% of the fetal liver population and 52% of the adult bone marrow. These mice exhibit less efficient cre-mediated recombination than B6.Cg-Tg(Cdh5-cre)1Spe/J mice (Stock No. <a href="https://www.jax.org/strain/033055">033055</a>), in which cre activity is seen in 85% of the fetal liver population and 96% of adult bone marrow. 
 <a href="https://www.jax.org/research-and-faculty/resources/cre-repository/characterized-cre-lines-jax-cre-resource">View</a> cre expression characterization.

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Cre expression in these transgenic mice can be seen in the embryo and in adult endothelium of developing and quiescent vessels, as well as in a subset of hematopoietic cells. When bred with mice carrying a loxP-flanked sequence of interest, Cre-mediated recombination will result in deletion of the flanked genome. These mice may be useful in studies of the cardiovascular system.

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