<i>Dkk1</i> reporter constructs and transient transgenic embryos analyzed throughout this study.

For each analyzed Dkk1 reporter construct, the total number of achieved transgenic E12.5 embryos and the respective amount of lacZ expressing embryos is given. Of those, the number of identical tissue specific expressions in optic cups, craniofacial domains, the brain, limbs and metanephros is given. Wh = wisker hairbuds; fm = frontonasal mass; mx = maxillar and mn = mandibular domains. Ectopic expression within a given domain is indicated with “+++”. Dkk1 reporter constructs and transient transgenic embryos analyzed throughout this study.