h19/h26 heterozygote has loss of h expression in the longitudinal preveins L3 and L5, location coincides with the ectopic expression of ac.
Strong bristle phenotype, but no defects in segmentation.
Class I allele: fully complements the lethality and segmentation phenotype of h25, and shows a strong bristle phenotype in trans with h1.
Selected on the basis of its failure to complement the bristle phenotype of either h1 or h2.