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size of aconcatamer - how big can a concatamer be (Aug/02/2006 )

can anyone tell me if I am getting a band of 21 kb while isolating plasmid along with other forms of a 3kb plasmid, is it a concatmer or genomic DNA?
the band did not disappear or intensify less on partial digestion with single cutter like R1.

-mili-

it is most probably genomic DNA. genomic DNA runs around 20kb

-dodosko-