Abstract
In the reactions with dye free radicals, catecholamines exhibited reversible electron donor and acceptor properties with the effectiveness increasing from tyrosine to norepinephrine. The physiological antagonists haloperidol and phentolamine showed opposite patterns of behaviour in the same reactions, changing their properties as acceptors to electron donors. The regularity observed is similar to that demonstrated earlier by a variety of Na + and Ca 2+ channel modulators.
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