Ab(1)oss heterozygotes do not show significant changes in intestinal stem cell proliferation (phospho-H3 staining) in the adult midgut, as compared to controls.
Ab(1)oss (affecting both upd1, upd3) homozygous mutant adults present a significant decrease in the bacterial burden, and significant increases in the survival and hemocyte numbers upon infection with Mycobacterium marinum, as compared to wild-type controls; non-infected individuals present similar survival and hemocyte numbers as compared to wild-type controls.
Homozygous Ab(1)oss mutant flies have small eyes compared to wild type. No wing defects are seen.