Table 4.

Quantitative Comparison of MT Number and Cross-sectional Area of Axons

Experiments	#1			#2
	MT number	Area of axons	n	MT number	Area of axons	n
tau+/+map1b+/+	7.8 ± 0.4	0.091 ± 0.006	223	6.7 ± 0.2	0.068 ± 0.003	322
tau−/−map1b+/+	5.7 ± 0.2	0.089 ± 0.005	227	6.8 ± 0.3	0.082 ± 0.005	239
tau+/+map1b−/−	5.6 ± 0.2	0.060 ± 0.003	425	5.2 ± 0.2	0.067 ± 0.003	480
tau−/−map1b−/−	2.4 ± 0.1	0.035 ± 0.002	710	2.6 ± 0.1	0.036 ± 0.002	663

MT number and area of axons (μm²) per axon were measured directly on electron-microscopic micrographs of anterior commissure sections in two independent experiments (#1 and #2). The mice were killed at postnatal week 4. The means ± SEM are shown. n, Number of axons examined.