These secondary metabolites include alkaloids, glycosides (steroids and phenolics), terpenoids and a variety of flavours, perfumes, agrochemicals, etc. The yield of these chemicals in cell culture, is though generally increased by manipulating physiological and biochemical conditions. In some cases, cell cultures accumulate these secondary metabolites at levels higher (2-10 times) than those found in whole mother plants, from which cell culture has been prepared. Automation in cell cultures discussed in the next chapter, can be used for industrial production of secondary metabolites. However, sometimes immobilized plant cells are used instead of suspension cultures to increase the efficiency of production system. These are described in more, along with a discussion on immobilized enzymes. Some of the important secondary metabolites obtained from plants are listed and plant cell culture technique can be profitably utilized to produce them at a commercial level (also consult on bioprocess engineering).