abhishek jain said on Mon, Feb 15, 2010 at 03:33:00PM +0530,:

 > I dont understand why any blood group donors are required!

Suubstitution.

Because most blood banks accept one donor's blood, and issue required
blood if the group of the donor I produce is not suitable for my
purpose.

Sometimes, the tests may take some time, and requirement may be very
urgent, so the banks may issue blood which is already tested.

-- 
Mahesh T. Pai   ||  http://[paivakil|fizzard].blogspot.com
"The greatest enemy of knowledge is not ignorance,
it is the illusion of knowledge."
--Stephen hawking

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