Anyone who studied a little genetics in high school has heard of adenine, thymine, guanine and cytosine - the A,T,G and C that make up the DNA code. But those are not the whole story. The rise of epigenetics in the past decade has drawn attention to a fifth nucleotide, 5-methylcytosine (5-mC), that sometimes replaces cytosine in the famous DNA double helix to regulate which genes are expressed. And now there's a sixth. In experiments to be published online Thursday by Science, researchers reveal an additional character in the mammalian DNA code, opening an entirely new front in epigenetic research.
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NEW YORK (AP) — Drugmaker GlaxoSmithKline PLC said Tuesday a study shows its human papillomavirus vaccine Cervarix was effective against the types of HPV that are most likely to cause cervical cancer, but also fought other strains of the disease.
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7/7/09
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