I undrstand about blood types but what does positive and negative mean ?

Subject: I undrstand about blood types but what does positive and negative mean ?

Date: Tue May 2 13:14:48 2000
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Area of science: Medicine
ID: 957291288.Me

Message:


what is a rare blood type?  I ask this because if I remember right this 
blood type can easily get this blood when they need it.

Re: I undrstand about blood types but what does positive and negative mean ?

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