title: Erratum.
abstract: One component (i-inositol at a concentration of 0.002 g/lit) of the nutrient medium was omitted from Table 1 of the article "Molecular Growth Requirements of Single Mammalian Cells," by G. Sato, H. W. Fisher, and T. T. Puck [Science 126, 961-964 (8 Nov. 1957)].