Embryonic expression of the eyes-absent homologue in the head of P. tepidariorum.
(A to E) Expression of Pt-eya during head development. A dynamic expression domain along the rim of the head lobes is denoted by arrowheads in A to C. Expression in the lateral eye primordia is indicated by white arrowheads in D and E. The black arrowheads in A and B point to expression at the base of the chelicerae. The arrows denote expression in the stomodeum (A) and in the labrum (B). All embryos are shown in frontal aspect. The developmental stage is indicated in each panel in the lower left corner.