| http://www.w3.org/ns/prov#value | - Just 4pc of the eligible population are active blood donors.A unit of blood is measured as 470 mls (or just under a pint) theNHSBT collects approximately 2m units of blood each year from 1.4m blood donors.There are four main blood groups ??? O, A, B and AB. Group O is the most common and therefore the most in demand.
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