Abstract
AbstractSoluble ribonucleic acid of baker's yeast was fractionated by countercurrent distribution and assayed for both cytokinin activity, using tobacco pith callus tissue, and for certain specific amino‐acid acceptor activities.Two groups of fractions showed cytokinin activity, one of which corresponds to serine and tyrosine transfer ribonucleic acids which are known to contain isopentenyl adenine, while the other corresponds lo undetermined species of ribonucleic acids.
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