Patent 7956171 was granted and assigned to Helicos Biosciences on June, 2011 by the United States Patent and Trademark Office.
The disclosure provides nucleotide analogs and methods of their use. Analogs of the invention comprise a reporter molecule (label) attached via the N4, N6, O4, or O6 position of the nitrogenous base portion of the analog. In a preferred embodiment, nucleotide analogs of the invention comprise a label attached to the nitrogenous base portion of the analog via a cleavable linker at the N4, O4, N6 or O6 position.