The axon terminal defects of gft⁸ are observed in mutant neuroblast clones, as well as in single-cell/two-cell clones of mutant γ neurons. Mutant neuroblast clones acquire shorter γ and β' lobes than wild-type clones. Most γ processes in the mutant neuroblast clones are only approximately two-thirds the length of wild-type γ processes. In contrast to the truncated γ and β' lobes, only subtle morphological defects are observed in the α, α', and β lobes. These three lobes extend as far as their wild-type counterparts, but their tips are rougher and less dense. Approximately 76% of single-cell/two-cell clones of mutant γ neurons, unlike their wild-type controls, fail to project axons to the tips of the γ lobes.

In wandering larvae, gft⁸ mutant clones acquire larval mushroom body-specific morphological features, including two perpendicularly oriented lobes, as well as two short bundles of terminal branches. No dramatic morphogenetic defects are observed in gft⁸ mutant clones at this stage, except subtle deformation of the termini of the medial axon bundles.

By 18 hours after puparium formation, most larval-specific axonal branches are pruned in gft⁸ mutant clones and look morphologically indistinguishable from their wild-type controls. In contrast to normal pruning, severe regeneration problems in gft⁸ mutant clones are observed. For instance, by 48 hours after puparium formation, regrowth of the majority of mutant axons is incomplete and appears unsynchronised. No age-dependent morphological changes are detected in gft⁸ clones after eclosion.

gft⁸ mutant γ axon clones exhibit few arbors. Approximately 57% of fully extended mutant γ neurons have no major (defined as over 15υm) axon arbors (compared to 15% in wild-type), suggesting that arborization is suppressed in mutant γ axons. However, a similar percentage of γ neurons (14% in mutant, 15% in wild-type) acquire fully extended 'arbor-free' axons, regardless of the size of arbor.

gft⁸ single cell mutant γ processes can terminate within any part of the γ lobes.

gft⁸ single cell mutant neuroblast clones exhibit a subtle phenotype in the α lobes.

Truncation occurs in 25% of gft⁸ β processes. All truncated β axons stall within either the proximal one-third segments or the distal one-third segments of the β lobes, close to the positions at which two clusters of arbors form in wild-type β processes.