Deficiency breakpoint between the C1 promoter and C2 promoter of slo, removing the C0 and C1 promoters.
slo18 completely complements the slo4 action potential phenotype; slo4/slo18 indirect flight muscles have action potentials of normal shape and duration. The flight behaviour defective phenotype of slo4 or slo1 is also complemented by slo18. slo18 fails to complement the slo4 "sticky-feet" phenotype seen after exposure to bright light.