Polytene chromosomes normal.
lesion in 19 to 20.5 kb
Lethal in combination with E(spl)1. Homozygotes have variable neural hyperplasia.
E(spl)m8-HLHrv30 is an enhancer of phenotype of Nspl-1
Homozygotes have weak enhancement of the Nspl-1 phenotype.
Failure to complement assessment based on lethal phenotype.