Fig3a. Copyright: This image is from [doi:10.1002/gene.10169] Wen F, Cecena G, Munoz-Ritchie V, Fuchs E, Chambon P, Oshima RG, "Expression of conditional cre recombinase in epithelial tissues of transgenic mice." Genesis 2003 35(2):100-6., and is displayed with the permission of Wiley-Blackwell who owns the Copyright.