Table 1. Motor neuron numbers from the spinal cords of the ageing cohort.

Group	Level of spinalcord	Number of mice	Mean MN count	Minimum MN count	Maximum MN count	Standard deviation
Male +/+	Cervical	6	30.3	17	45	9.4
	Thoracic	6	33.3	16	49	12.6
	Lumbar	4	26.3	19	38	8.4
Male +/wst	Cervical	5	32.6	29	37	3.8
	Thoracic	6	29.1	25	38	4.6
	Lumbar	4	14.4	10	32	9.6

Mean motor neuron counts from spinal cord sections from the ageing cohort. WT indicates wild-type animals, HET indicates heterozygote animals N  =  number of animals in the group, Mean  =  average of group, Min  =  minimum reading of group, max  =  maximum reading of group, S.D  =  standard deviation. No differences were significant.