why does histone methylation occur over large areas of chromatin
Histone methylation The genome is tightly condensed into chromatin, which needs to be loosened for transcription to occur. In order to halt the transcription of a gene the DNA must be wound tighter. This can be done by modifying histones at certain sites by methylation. Histone methyltransferases are enzymes which transfer methyl groups from S-Adenosyl methionine onto the lysine or arginine residues of the H3 and H4 histones. There are instances of the core globular domains of histones being methylated as well.
Stockholm Water Prize 2006: Professor Asit K. Biswas, The Third World Center for Water Management
The Donna Reed Show Episodes revolve around the lightweight and humorous sorts of situations and problems a middle-class family experienced in the late 1950s and the early 1960s set in fictional Hilldale, state never mentioned.
Denial-of-service attack A wide array of programs are used to launch DoS-attacks.