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(A) The scale shows the number of recombinant individuals in the BC mapping population (n = 106) at markers (M) identified in a chromosome walk (W). The walk proceeded from marker 134 towards marker 124 and was composed of BACs (grey boxes) and FPC-based BAC contigs (blue boxes). (B) Fluorescence in situ positions of markers 124, Hf5p7 and 134 on the short arm of HF polytene chromosome X2. The arrowhead indicates the position of the X2 centromere.
