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In situ hybridization with biotinylated cosmid probes to Drosophila melanogaster 2R chromosomes (Canton S strain). Thin arrows denote the probe insertions on sections 55 and 56. Thick arrows point to the tips of the 2R chromosomes (at the left). Cosmid 119c2 hybridizing on bands 55C1–2, 55C3, and 55C4–5. Cosmid 27B7 hybridizing on bands 55D1–2 and 55D3. Cosmid 59G5 hybridizing on bands 55F5–11 and 56A.
