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Presumed cohesion (red) along an undamaged metaphase chromosome of the field bean (left) and along a homolog with a circular interstitial chromatid deletion of (darkly stained) heterochromatic material from the left chromatid (right) imaged after Giemsa banding. The ring-shaped deleted chromatin remained attached to the homologous region of the undamaged sister chromatid (modified after Schubert et al. 1994). Bar, 1 μm.
