The present invention relates to a method of determining the genotype of a sample polynucleotide having at least a first variant site. At least a portion of the sample polynucleotide is amplified to obtain first amplicons, the first amplicons including the first variant site. The first amplicons are...http://www.google.com/patents/US20040076947?utm_source=gb-gplus-sharePatent US20040076947 - System and method for determining known DNA variants with temperature gradient electrophoresis