Fig. 4.
Broadening of dorsal longitudinal flight muscle action potentials stimulated at 10, 20, 33, and 50 Hz. The half-height width of six consecutive action potentials were measured. Width is expressed in milliseconds. Black,stippled, gray, and whitebars represent an average from wild-type animals (n= 3), slo4/+ heterozygote animals (n = 9),ash218/slo4transheterozygous animals (n = 6), andslo4 homozygous animals (n = 10), respectively. The thin line above the bar represents the SEM for each measurement. Ap1, Ap2,Ap3, Ap4, Ap5, andAp6 represents the width of the first, second, third, fourth, fifth, and sixth action potentials, respectively.