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How to get the clone?

Thianchai Lakornrach - SCBT - 3636209 gsctlr at mahidol.ac.th
Wed Oct 4 05:48:17 EST 1995

 	I am trying to screen my transformant yeast which contain 
YEp-based shuttle vector by URA-3 auxotroph test. OK, I have got the 
positive clones but  when I check their plasmids , I can't found them, by 
glass bead extraction and transform back into the E.coli. Can anyone explain 
to me why no have E.coli transformant when the auxotroph screen is give 
me a positive result? And anyone can tell me where can I get the detail 
of this case?
    	Thank you .

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