DNA precipitation?

steve johnson sljohnsn at ux1.cso.uiuc.edu
Wed Mar 13 16:06:57 EST 1996

Lately when I'm doing a DNA isolation and I add EtOH I don't 
get any visible precipitation. After incubating at -20 
overnight I get alot of small "flakes".

Now here's the confusing part to me. I had assumed that this 
was because the DNA was badly sheared. However, after running 
the DNA out on a gel I saw that I had nice high molecular 
weight bands. Can anyone enlighten me as to why this might be 

                               Steven Johnson
                               Technical Research Scientist
                               Center for Aquatic Ecology
                               Illinois Natural History Survey
                               Champaign, IL
                               sljohnsn at ux1.cso.uiuc.edu

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