Table 4.

Means and p values for Figure 9A^a

	Mean ± SEM				Post hoc Tukey test, p value
	WT TR	WT DR	KO TR	KO DR	WT TR-WT DR	KO TR-KO DR	WT TR-KO TR	WT DR - KO DR
P21 segment number	45.4 ± 2.3	42.9 ± 1.8	55.0 ± 2.7	46.3 ± 2.4	0.392	0.018*	0.008*	0.255
P21 segment length	64.6 ± 2.0	57.5 ± 2.2	61.6 ± 1.8	66.1 ± 2.5	0.022*	0.161	0.271	0.014*
P30 segment number	38.6 ± 1.8	41.4 ± 1.9	38.8 ± 2.2	40.9 ± 2.2	0.299	0.494	0.953	0.872
P30 segment length	71.7 ± 2.7	56.7 ± 1.7	66.8 ± 2.1	63.1 ± 2.1	0.000009*	0.218	0.165	0.020*

^ap values for additional P21 comparisons can be found in Figure 9F.

*Significant comparison.