Abstract
A cytokinin-binding protein fraction was isolated from normal rabbit sera by affinity chromatography. The protein fraction bound tritium labelled N6- (δ2-risopentenyl) adenosine and the order of inhibition of this binding by competing non-radioactive compounds was, N6-(δ2-isopentenyl) adenosine N6-(δ2-isopentenyl) adenine adenosine. The protein fraction showed broad specificity, the prefered cytokinin being N6-(δ2-isopentenyl) adenosine. This is the first report of the isolation of cytokinin binding proteins from mammalian sources.
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