Figure 5: Late AZK treatment affects the oral-aboral but not the directive axis.
From: Pre-bilaterian origin of the blastoporal axial organizer

(a) Scheme of late AZK treatment and a resulting double-headed primary polyp. (b) An ectopic domain positive for the oral marker FoxA appears on the aboral end of the planula subjected to late AZK treatment, however, unilateral expression of Dpp and Chd in treated embryos is retained. Blastopores point up. Scale bars: 100 μm.