Figure 4.

PcG mutants are not defective in maintenance of axon terminals. (A,B) Axons of class IV neurons were visualized in the ventral nerve cord using ppk∷EGFP. Images of class IV axon projections from wild-type (A) or esc²¹ mutants (B) were taken from the same larvae and at the same time as images in Figure 3, B and D, respectively. (C–E) Axon terminals of control (C), E(z)⁶³ (D), and Pc^XT109 (E) MARCM clones. Clone genotypes were the same as in Figure 1. Representative clones without contralateral projections are shown, but we also observed contralateral projections in control, E(z)⁶³, and Pc^XT109 mutant clones with approximately the same frequency.