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Homocysteine concentrations (mean ± s.d.) in supernatants of unstimulated peripheral blood mononuclear cells (US) and of cells stimulated with concanavalin A (Con A) and phytohaemagglutinin (PHA) supplemented with methionine (500 µmol/l) and/or folate (10 µmol/l). *P < 0·01 (comparison between experiments with/without methionine supplementation).
