Source:http://linkedlifedata.com/resource/umls/id/C0019397
MSH: The portion of chromosome material that remains condensed and is transcriptionally inactive during INTERPHASE.,CSP: regions of the genome that are permanently in a highly condensed condition and are not genetically expressed.,GO: A compact and highly condensed form of chromatin. [GOC:elh],NCI: A tightly packed area of chromatin that may function to protect chromosome integrity and regulate gene expression.