The amount of DNA contained within a haploid nucleus of eukaryotic organisms is termed the C (constant) value. Monosomatic tissues containing mitotically active cells are characterized by cells with nuclear DNA contents ranging from 2C to 4C, depending on the position of the cells within the cell cycle. In polysomatic tissues, endoreduplication can occur producing uninucleate cells having multiplicative DNA contents (2nC, where n = 1, 2, 3...).