Expression of Tc-ems and Tc-slp-1 in wildtype, Tc-kni RNAi and antennaless embryos. Panels B, D, E, G and H represent documentation of fluorescent FastRed stainings of the respective gene and are therefore shown in grayscale. Tc-ems expression in the antennal (white arrowhead, panels A, B) and mandibular (black arrow, panels A, B) segments is abnormally fused in Tc-kni RNAi embryos (red arrows in panel B; compare to panel A). A black arrowhead marks the maxillary domain of Tc-ems expression in panels A, B. The antennal Tc-slp-1 expression domain (white arrowhead, panels C-H) is often expanded, while the mandibular (black arrow, panels C-H) and maxillary (black arrowhead, panels C-H) Tc-slp-1 expression domains are fused (red arrows in panels D-E, G-H) in Tc-kni RNAi and antennaless embryos. Ventral views, and anterior to the top, in all panels.