Fig. 1. Expression of gap genes at embryonic stages 9 (st9) and 10 (st10). Semi-schematic presentations of the left half of head flat preparations [anterior (a) is towards the top; dorsal (d) is towards the left]. Colour code indicates protein expression patterns of Empty spiracles (ems), Hunchback (hb), Orthodenticle (otd), Sloppy paired 1 (slp1), and the huckebein-lacZ (hkb) and tailless-lacZ (tll) patterns in identified brain neuroblasts [A,E; colour intensity reflects weak () and strong (+) expression] and the peripheral procephalic ectoderm (B-D; F-H; thick hatching indicates strong expression, thin hatching indicates weak expression) at stage 9 (A-D) and stage 10 (E H). Nomenclature of brain NBs is according to their position in the trito- (T), deuto- (D) and protocerebrum [P; for details of the nomenclature see Urbach et al. (Urbach et al., 2003)]. Red lines in A,E mark the boundaries between trito-, deuto- and protocerebrum. In B,F, ems ectodermal domains arising from the blastodermal ems stripe are numbered (1-4; compare with Fig. 2N). In D,H, high level and low level tll-lacZ expression domains correspond to HL and LL in Rudolph et al. (Rudolph et al., 1997). Note, that slp1 is segmentally expressed in the intercalary (slp1 is, slp1 intercalary stripe) and antennal (slp1 as, slp1 antennal stripe) ectoderm. Stars indicate mandibular NBs. Engrailed ectodermal domains (encircled in red) are shown for comparison. as, en antennal stripe; CL, clypeolabrum; FG, forgut; hs, en head spot; is, en intercalary stripe; ML, ventral midline; slp1 oc, ocular slp1 domain; slp1 lr, labral slp1 domain.

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