Kinetin is a kind of cytokinin, a class of plant hormone that promotes cell division. Kinetin was originally isolated as a compound from autoclaved herring sperm DNA that had cell division-promoting activity. It was given the name kinetin because of its ability to induce cell division, provided that auxin was present in the medium. The story of the discovery of kinetin is a fascinating example of the twists and turns of scientific discovery. Kinetin is often used in plant tissue culture for inducing formation of callus (in conjunction with auxin) and to regenerate shoot tissues from callus (with lower auxin concentration).