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Left arm of S. cerevisiae chromosome III. ARS elements within the 40-kb region of chromosome III are marked. The ARS305 replicator (305), which is associated with an active origin, ORI305, is underlined. ARS elements in the HML ARS cluster (302, 303, 320) are marked in bold. ORI305 is the only active origin within this part of the chromosome. The HML locus is normally replicated by a fork derived from ORI305, as indicated by the arrow.
