Volume 21, no. 4, p. 1098-1110, 2001. Page 1099, Materials and Methods, “Transfection,” lines 1 to 3: It was stated that the BamHI-KpnI ori-β fragment cloned in pUC19 was linearized with AatII to generate the 5.8-kb DHFR insert flanked by vector DNA. It has since been discovered that the AatII site is absent in the vector used for those experiments, and thus the transfections were carried out with circular plasmid DNA. The data and conclusions in the paper are not affected.
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The Chinese Hamster Dihydrofolate Reductase Replication Origin Beta Is Active at Multiple Ectopic Chromosomal Locations and Requires Specific DNA Sequence Elements for Activity
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