They will include generating DNA constructs for generation of transgenic mice, basic manipulation of mouse embryos, maintenance of a mouse colony, and use of a variety of developmental biology, cell culture, immunohistochemical and molecular biology techniques to analyze tissues and cells in order to understand how endothelial cells differentiate into arterial and venous cells during development. Restriction enzyme digestion and mapping, agarose and acrylamide gel electrophoresis, isolation of DNA from agarose gel, ligation of DNA, transformation of DNA, mini- and maxi-preparation of DNA, PCR, isolation of RNA, southern, northern, and western blotting, synthesis of cDNA from RNA, quantitative RT-PCR, in-vitro transcription.