Definition: Metachromatinic is a term used in molecular biology and genetics to describe specific regions of DNA that are altered or modified by mutations. These regions are often referred to as "metachromatin" because they have been observed to be present in certain types of cells, such as those found in mammalian cells, where the DNA is being methylated or methylation is occurring. Metachromatin can be divided into two major categories: euchromatin and heterochromatin. E