Positive selection vectors

M.C.Behrendt M.C.Behrendt at shef.ac.uk
Wed Jun 14 08:12:39 EST 1995

Are there any really good foolproof positive selection vectors about, 
the only good one I've discovered so far is pKSS which codes for a 
phenylalanyl-tRNA synthetase alpha subunit with relaxed substrate

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