Chemicals which, regardless of their other activities, promote cell division in cells of various plant origins usually when grown as callus in aseptic culture. For the most part endogenous cytokinins are all N6 substituted adenine derivatives, for example zeatin from Zea mays and N6 (yy-dimethlallyl amino) purine from cultures of Corynebacterium fascians. A number of non-purine synthetic compounds such as azakinetin, N, N1 diphenyl urea and benzimidazole are known to possess cytokinin-like activity. Note: the term cytokinesis should ever be used to describe the promotion of cell division; it is correctly applicable to the cytoplasmic changes accompanying mitosis, or to the cleavage of cytoplasm into daughter cells after nuclear division.