For months, I've spent my Saturdays speaking with a convicted killer, writes Anne Connolly. He says he's innocent, others ...

DNA methylation is the covalent addition of methyl groups to DNA bases, typically the cytosine of CpG dinucleotides. It is catalyzed by methyltransferase enzymes using a S-adenosyl methionine ...

In a nutshell All modern humans share DNA from two ancient populations that split 1.5 million years ago and reunited through ...