Cloning vector with 'lethal' gene?

Muhammad Lodhi lodhi at CSHL.ORG
Mon Jun 5 08:16:58 EST 1995

Could someone give me the info on the commercial source of a newly
introduced cloning vector that has a 'lethal' gene on the cloning site.  I
heard that in this cloning system only the cells with the cloned fragments
can grow that way all the background is clear.  Any help will be highly

Muhammad A. Lodhi
Cold Spring Harbor Laboratory

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