Polytene chromosomes normal.
lesion in -15.5 to -11.5 kb
Lethal in combination with E(spl)1. Homozygotes have variable neural hyperplasia.
E(spl)m8-HLHrv29, gro1 has lethal phenotype
E(spl)m8-HLHrv29 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.