Control Mechanisms in the Expression of Cellular Phenotypes: Volume 9

Normal functioning of many cells requires precise localization and orientation of organelles and other subcellular parts, yet the genetic determination of such essential organization has been relatively little investigated. Among the few relevant studies are those carried out on ciliated Protozoa (e.g., Stentor, Paramecium, and Tetrahymena), which have proved to be especially favorable materials for attacks on such problems. For example, the cortex of nondividing paramecia consists of precisely localized and definitely oriented parts organized into several levels of structure.