On Tue, 19 Apr 2005 22:31:55 -0700, Bob wrote:
> On Tue, 19 Apr 2005 19:47:19 +0200, The Duck <theduck at earth.com>
> wrote:
>>>Dear All,
>>>>I was hoping that you could give me some advice to the following problem:
>>>>I would need to cut large circular DNA (several hundreds of kilobases in
>>size) exactly once (or at most only a few times).
>> You hedged there in (). That makes a big difference. Cutting exactly
> once -- without knowing anything -- sounds hard. Cutting "not much"...
> Why not use a rare-cutting restriction enzyme? An enzyme with an
> 8-base recognition sequence cuts, on average, every 65 kb.
>> Look at the New England Biolabs catalog. Their discussion of megabase
> mapping may help you.
>> bob
Thank you bob, will do.
