Methyltransferases are concerned in epigenetic gene regulation by covalent modification of histones. I would say it's unlucky that their tablets, applications, and bonus DVDs haven't really worked out, however now that I am a foodist, I see the failure of the dieting industry to make us thinner or more healthy as one of the luckiest mess-ups of our technology.
This school of thought say that lysine doesn't play any position in the battle towards chilly sores.
The exception to the rule is the DOT1 family, members of which methylate K79 in the globular area of histone H3 and which are structurally not associated to SET-domain proteins four - 6 Current work suggests that SET-domain-containing proteins methylate a few proteins along with histones (see later)