highly significantp = 4.20e−3
For the Cre viruses, the difference was smaller, presumably due a ceiling effect (see discussion ), but still highly significant: at 1 week, the ΔL-Cre virus had labeled 1.40 times as many cells as ΔGL-Cre (single-factor ANOVA, p = 4.20e−3; n = 4 mice each group); and at the 4 week time point, the ΔL-Cre virus had labeled 1.25 times as many cells as ΔGL-Cre (single-factor ANOVA, p = 7.38e−4, n = 4 mice per group; see Data S1 for counts and statistical comparisons).