Part of Szent-Gyorgyi's early work in "quantum biology," this study used electron spin resonance (ESR) technique to investigate charge transfer in biological complexes such as serotonin and flavin mononucleotide (FMN). He found that serotonin and FMN analyzed separately gave no ESR signal (thus indicating that no free radicals had been formed) but when combined, in an acid, they did.
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Isenberg et al. (1960) studied this question.
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