[color=#000000

ost_uid0][b

ost_uid0]Q:[/b

ost_uid0] What's the difference between methylating the third residue and de-acetylating the fourth residue of the histone H3?
[b

ost_uid0]A:[/b

ost_uid0] The long, slow slide into fanaticism.[/color

ost_uid0]