kromatiin, mis värvub tugevalt isegi interfaasis, olles tugevalt kokku pakitud olekus ja sisaldades tavaliselt väheste geenide kordusjärjestusi; geneetiliselt inaktiivne kromosoomiosa, a chromatin that stains tightly even in interphase, it is tightly packed form of DNA and consists usually of only few genetic repeated sequences, genetically inactive part of chromosome