Table 1.

Participation of P0ct-myc in compaction of myelin

Genotype	Compacta	Non-compact	Period (Å) [mean ± SEM (n)]b
P0ct-myc(−/−)	170	30	162 ± 3.0 (11)
P0(−/−)	150	59*	153 ± 2.8 (14)**

^aCompact: fibres with at least some compacted wraps of myelin; non-compact: fibres with no compacted wraps.

^bn denotes total myelin sheaths from three nerves (animals) of each genotype.

*P < 0.0001 by χ² analysis for 1 degree of freedom.

**P < 0.05 by Student's t-test.