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Venous blood from 30 volunteers was collected in tubes and centrifuged at
2500 x g to separate plasma. To determine asymmetric dimethylarginine
(ADMA) concentrations, plasma samples were diluted 1:100 and 1:000 and
analyzed with an Enzyme Linked Immunosorbant Assay (ELISA) kit, a gift from
Cardiovasics Medical Science Laboratory, (Palo Alto, California). To
classify as low or high-risk, plasma ADMA concentrations measured for each
volunteer was tested on partially purified preparations of endothelium
nitric oxide synthase (eNOS) (Reif and McCreedy).
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