After the completion of human genome sequencing, biologists have been drawing small differences in bases, that is, single nucleotide polymorphisms  These small differences have become the key content of more than 10 research projects in 2007
In these so-called extensively linked genome studies, researchers compared the DNA of thousands of diseased or non-diseased individuals to determine which small genetic differences would bring disease risks to humans
In the future, more people will know exactly what kind of disease they are at risk.