Genetic abnormalities are most often discussed in terms of differences so miniscule they are actually called "snips" - changes in a single unit along the 3 billion that make up the entire string of human DNA. "There's a whole world beyond SNPs - single nucleotide polymorphisms - and we've stepped into that world," says Brian Teague, a doctoral student in genetics at the University of Wisconsin-Madison. "There are much bigger changes in there...
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