Table 2.

The lengths of the first internode examined and the incidence of ribosomes in the internode

		The incidence (%) of ribosomes in
Axon	Length of the first internode examined (µm)	0–30 (µm)	30–60 (µm)	> 60 (µm)
A	103.7	35	1.5%	2.9%
B	81.0	82	4.5%	3.4%
C	88.6	81	3.8%	1.4%
D	62.1	84	3.1%
Mean ± SD		71 ± 24%*	3.2 ± 1.3%*

The first internode of only axon A could be followed along the entire length. The number of sections containing ribosomes was counted in every 30-µm-long distance from the initial segment endpoint along the internode. The proportion (%) of sections in which ribosomes were found was defined by the incidence of ribosomes.

^*Ribosomal incidences were significantly different between the first and second 30-µm-long portions (P < 0.005, student's t-test).