(A) No significant effect of pan-neuronal or pan-glial PGA expression on negative geotaxis behavior at 3 and 6 weeks of age (two-way ANOVA for the effect of age (p<0.0001) and genotype, (n.s.), n=3–6 groups of 25 flies/genotype/age). (B) Significant effect of ubiquitous PGA expression on negative geotaxis behavior at 3 weeks of age (two-way ANOVA for the effect of age (p<0.0001) and genotype (p<0.0001), Bonferroni post-test, ****p<0.0001, n=5–6 groups of 25 flies/genotype/age). (C) Survival is slightly extended upon pan-neuronal or pan-glial PGA expression. (D) Significant effect of ubiquitous PGA expression on survival. For C and D, see Tables 1 and 2 for experimental n, lifespan metrics, and log-rank (Mantel-Cox) comparison results. Data are mean ± SEM. See also Figure 5—figure supplement 1.