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Effects of the gypsy insulator on the structure of a heat shock puff. Structures of the P[gyp-gyp] transposon and derivative transposons are shown. Symbols were described previously in Fig. 2. The gypsy insulators are represented by black triangles. All chromosomes were isolated from heat-shocked larvae containing the indicated transposon at cytological position 71E. Chromosomes were hybridized with either the white probe (left) or the lacZ-hsp70 probe (right).
