Studies on the distribution and properties of a new class of cell division--promoting substances from higher plant species.

One member of a new class of cell division-promoting substances, which are nicotinamide derivatives, has been found to be present in dividing cells of tobacco and cactus. These plants are taxonomically far removed from one another and from Vinca rosea L., the plant species from which the new substances were first isolated. Because of their apparent wide… (More)