Smear in gel lanes (mini preps)

Chip Peele chip_peele at
Fri Feb 2 18:27:01 EST 1996

When I run out digested plasmid DNA from alkaline mini preps I get 
appropriate bandsas well as a smear throughout the lane.  When I 
digested plasmid DNA isolated via qiagen maxi prep I did not see this 
smear.  I have not had this problem in the past!!  Is it possible that 
the cells that I am using could be the culprit.  The competent cells 
that I used for transformations had thawed out, so I used them to make 
more competent cells.  Is it possible that this could be the problem???

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