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Fig. 2. Expression of Tc'giant in successive developmental stages. (A-D,F-K) Embryos are oriented anterior towards the left; (E) embryo viewed from the posterior pole. Blastoderm stages (A-E) are oriented dorsal side upwards. Germ band embryos (F-K) were dissected from the yolk and are shown in ventral view. (A-C) After initial ubiquitous maternal expression, Tc'giant forms an anterior domain comprising brain and gnathal segments, but excluding the anteriorly located extra-embryonic serosa. (C,D,F) In the maxilla, expression becomes stronger (black arrowhead) before anterior expression condenses (G-K) in a complex pattern in the brain. (D,E) A second domain arises de novo at the posterior pole of the late blastoderm and later splits in two domains that cover T3 and A2 (white arrowheads). See text for further details.





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