At the journal club last week (13 March), we discussed the amazing study about the genetic basis of Batesian mimicry in Papilio polytes by Kunte et al. (2014, Nature). A supergene complex was expected, a single genes was detected - doublesex. Mimicry controlled by gene expression regulation (but how?), but not by specific spliced iso-forms. A really nice paper and a must read for every evolutionary geneticist.