Kinetins are cell division factors which are found in various plant parts and in yeast. They are used as plant growth regulators.
http://www.phytotechlab.com/detail.aspx?ID=401
kinetin is a plant hormone that, when paired with auxin (another plant hormone), results in prolific growth of undifferentiated cells.
Kinetin is a kind of cytokinin, a class of plant hormone that promotes cell division. Its chemical formula is C10H9N5O