Chromosome structure in four wild-type polytene tissues of Drosophila melanogaster. The 87A and 87C heat shock loci are induced unequally in the midgut in a manner dependent on growth temperature.

Chromosome structure in four wild-type polytene tissues of Drosophila melanogaster. The 87A and 87C heat shock loci are induced unequally in the midgut in a manner dependent on growth temperature.