Fig. 4
From: New insights into mesoderm and endoderm development, and the nature of the onychophoran blastopore
Expression of Tbx15-like In all panels, anterior is to the left. Panels A–D and F represent ventral views. Panel E represents a thin section, lateral view, dorsal up. Panels A´–D´ represent SYBR Green staining of the embryos shown in panels A–D. The dashed circles in panels A–D mark the posterior pit region. The dashed line in panels A and B mark the embryonic slit. The red asterisk in panels D and E mark the position in a whole mount (D) and a thin section E. Arrowheads and double arrowheads in panels C, D and F mark expression in the last-formed posterior somites. Developmental stages are indicated (staging system after [9], their supplementary data). Abbreviations: ect, ectoderm; hl, head lobe; j, jaw; mes, mesoderm; sp, slime papilla