Action of 5-hydroxytryptamine on growth of Raphanus sativus root

Abstract
5-hydroxytryptamine has an intense inhibitory action on the growth of Raph. sativus root for then days following germination in a tenthousandth molar concentration.
This inhibitory effect is even more manifest in a concentration of a hundredthousandth molar, but can scarcely be appreciated at a millionth molar concentration.
The inhibitory action of 5-hydroxytryptamine is practically that of 3-propionie indol in the same concentrations.
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