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Fig. 7. Models of bwD behavior near the centromere. A constraint in movement is imposed when the distance between bwD-CIDGFP is between 1 and 2 µm. The distribution of the traces in Fig. 6 could be interpreted in two ways. (A) Constraint may be imposed wherever bwD contacts the surface of the heterochromatic compartment and the seemingly large variation in distance from the centromere could be because of the variable position of the centromere within the mass of heterochromatin. (B) bwD moves within the centric heterochromatin, varying its distance to the centromere. Possibly the endpoint of this random walk is a stable, close association with the centromere.