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Fig. 2. Neither the HOMRE nor the DPPRE shows the same genetic requirement for expression as lab550. Expression of lab550 (A-E) is compared with the expression of 48/95 (HOMRE; F-J), 92/546 (DPPRE; K-O) and 92/546m300(DPPREm300; P-T). Expression is analyzed in wild-type embryos (A,F,K,P) or in embryos mutant for abd-A (B,G,L,Q), wg (C,H,M,R) or dpps4 (E,J,O,T). Expression was also analyzed in embryos expressing a constitutive active version of the DPP receptor TKV (tkvQD) in the endoderm (D,I,N,S). Note that in contrast to lab550, 92/546m300 is strongly expressed in the gastric caeca endoderm (arrows, P,Q).