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Blood serum pyridoxal-5-phosphate, homocysteine and neopterin concentrations have been examined in 30 healthy individuals and 87 patients with coronary heart disease, verified by coronary angiography. Patients have been observed before percutaneus transluminal coronary angioplasty (31 patients with one-artery disease, 30 with two-or three-artery disease, 26 with restenosis). Results suggest that lowered serum pyridoxal-5-phosphate concentrations were an earlier indicator of coronary heartdoi:10.1515/pteridines.2002.13.3.100 fatcat:udxvsii6uvgrtpc6g3lidbdsma