n. the material of a cell nucleus that stains with basic dyes and consists of DNA and protein: the substance of which the chromosomes are made. See euchromatin; heterochromatin.... chromatin
n. chromosome material (see chromatin) that stains most deeply when the cell is not dividing. It is thought not to represent major genes but may be involved in controlling these genes, and also in controlling mitosis and development. Compare euchromatin.... heterochromatin
Health Encyclopedia