Abstract
Neither cell division nor growth of S. cerevisiae were stimulated by the UV luminescence produced by adjacent exponential phase cultures of the yeast. The study included experiments in which the inocula (density = 5 .times. 107 cells cm-3) were irradiated and in which lag phase cultures (densities = 1 .times. 106 or 5 .times. 106 cells cm-3) were irradiated for 30 min with the yeast luminescence. These results do not support the claims of earlier workers that dividing cells can stimulate mitosis in optically coupled cultures by the so-called mitogenetic effect.

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