Fig. 6. Localisation and effect on PEV of tagged constructs containing different sets of zinc fingers. Localisation was determined by immunostaining of polytene chromosomes. –, no binding on euchromatic arms: +, discrete number of bands on euchromatic arms; +++, band-interband pattern on euchromatic arms. Effect of constructs on PEV were determined by crosses with the Heidi variegating line. Black box, HA tag; grey boxes, zinc fingers; light grey boxes, incomplete zinc finger; black bars, tryptophan boxes.