can gram (+) change gram (-) ? or can gram (-) change gram (+)?

Subject: can gram (+) change gram (-) ? or can gram (-) change gram (+)?

Date: Wed Jun 30 06:52:03 1999
Posted by jee
Grade level: undergrad School: kwanwon national university
City: chunchon State/Province: kwanwon Country: korea
Area of science: Microbiology
ID: 930743523.Mi

Message:


help me
can gram (+) change gram (-) ? or can gram (-) change gram (+)?
if possible, can this vertify?

Re: can gram (+) change gram (-) ? or can gram (-) change gram (+)?

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