Genes can also be turned off by RNA when it is in the form of antisense transcripts, noncoding RNAs, or RNA interference. RNA might affect gene expression by causing heterochromatin to form, or by triggering histone modifications and DNA methylation (Egger et al ., 2004).or example, methylation of a particular lysine (K9) on a specific histone (H3) that marks silent DNA is widely distributed throughout heterochromatin. This is the type of epigenetic change that is responsible for the inactivated X chromosome of females.
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The U.S. Food & Drug Administration regulates how much caffeine a 12-oz. drink can contain, according to the Center for Science in the Public Interest, which is 71 mg per serving. Caffeinated soft drinks that contain this limit or nearly this limit include Vault, Jolt Cola, Mountain Dew MDX and Coke Blak.maller Amounts. Soft drinks containing less than 40 mg of caffeine per 12-oz. serving include Coca-Cola and Coca-Cola Zero, which both contain 35 mg of caffeine, according to the Mayo Clinic. Diet Pepsi and Pepsi contain between 36 and 38 mg of caffeine per serving. Pepsi Wild Cherry contains 38 mg.