“…Mutation of one copy of mod results in a suppression of variegation of B in if, since the average number of facets is 330. mod is a newly identified dominant suppressor of PEV, distinct from the two previously described modifiers in the region. Indeed, the first, E(var) JOOC-F, located between 10OC5-D1 and the tip of 3R, is a dominant enhancer of PEV (Tartof et al, 1989), whereas the second, Suvar(3)12, located at lOOF 3-5, is a dominant suppressor (Reuter et al, 1986) nuclei with UV light. According to Chatterjee et al (1988), only those proteins that contact DNA with a favourable geometry can form covalent adducts upon exposure to UV light and remain associated to DNA during CsCl gradient purification.…”