| http://www.w3.org/ns/prov#value | - present in a first sample of whole blood with purified protein derivative (ppd) in the presence of antibodies against cd28, or cd28 and cd49d; processing of ppd by antigen-presenting coils (apc) by incubating for 1.5 h to 2.5 h, especially for 2 h, at 35?? c.
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