This protocol is from:Hare EE, Peterson BK, Iyer VN, Meier R, Eisen MB (2008) Sepsid even-skipped Enhancers Are Functionally Conserved in Drosophila Despite Lack of Sequence Conservation. PLoS Genet 4(6): e1000106. doi:10.1371/journal.pgen.1000106Please see the full manuscript for additional details.(Image: calf, Jim Champion, CC BY-SA)