Fig. 5. The cross sectional areas of the cell bodies of P1 SCG neurones (at the level of the nucleolus) of wild-type, Ngf^–/–, Bax^–/– and Ngf^–/– Bax^–/– mice resulting from crossing Ngf^+/– Bax^+/– mice and wild-type, TrkA^–/–, Bax^–/– and TrkA^–/– Bax^–/– mice resulting from crossing TrkA^+/– Bax^+/– mice. The percentage of neurones whose cross sectional area lies within defined limits are shown. The data are compiled from measurements derived from at least 100 neurones taken at random in the SCG of three neonates of each genotype.