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Fig. 3. Effect of the loss of btd, Sp1and Dll on the formation of Keilin's organs (KO) and ventral pits (VP). The third thoracic and first abdominal denticle belts are shown. (A) Wild-type segment displaying the normal set of KOs and VPs, a pair of each per segment. (B) btdXG81 larva. Only one KO is present and it is defective. The two ventral pits are present in this case, but they are frequently lacking in the mutant larvae (see main text). (C) Df(1)C52 larva showing complete absence of KOs and ventral pits. (D) DllSA1 larva. The KOs are always missing but the ventral pits are present.