Abstract
The use of reporter genes such as beta-galactosidase and green fluorescent protein is a powerful molecular tool for the visualization of in-vivo gene expression. In this paper, we describe the generation of mice that possess a beta-galactosidase reporter gene introduced into the endothelin-B receptor locus by homologous recombination in embryonic stem cells. These mice express beta- galactosidase wherever endothelin-B is expressed and therefore provide a precise in-vivo localization profile of endothelin-B expression.
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