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Fig. 3. (A) Map of wEN:mini-white construct containing the white enhancer (wEN), a mini-white reporter gene, and the scs' boundary element to block 3' position effects. (B) Representative adult males homozygous for transgenes containing the 1.2 kb Fab-7 element, pHS1x4, dHS1x4, dHS1Ax4 or dHS1Bx4. (C) Summary of the blocking activity seen in wEN:mini-white transgenic lines with the different boundary elements shown in Figs 2 and 4.