Fig. 2. Axial patterning of the antennal disc during larval and pupal development. Representative images with several marker combinations are presented for early-mid L2 (A,F,K,P), late L2 (B,G,L,Q), early L3 (C,H,M,R), late L3 larvae (D,I,N,S) and early pupae (E,J,O,T). (A-E) Inv (green) and Dfd (red) expression. (F-J) Inv/En (green) and ptc-lacZ (ptcZ, red) expression. Arrowheads mark maxillary Inv-expressing cells in C-E,H-J. (K-O) Wg (green) and dpp-lacZ (dppZ, red) expression. (P-T) Dll (green) and Hth (red) expression. Dll is co-expressed with Hth in both antennal (S) and maxillary primordia (T, inset). The results are summarised at the bottom in which Hth is indicated with a purple background. eL2, early L2; lL2, late L2; eL3, early L3; lL3, late L3. Antennal discs are oriented with posterior towards the right and dorsal towards the bottom; e, a and mx indicate eye, antenna and maxillary primordia, respectively.