BioVision offers low price and high quality Chemically Modified siRNA Oligos. All our siRNA oligos undergo vigorous process monitoring and strict quality control. Length and labeling are systematically controlled by PAGE or Mass Spectrometry Analysis. Quantity is systematically validated by UV absorbance at 260 nm. BioVision's chemically modified siRNA oligos results in greater longevity in cell culture and stability in cell culture and in serum thereby enhancing the ability for this to be used for in vivo applications and has much more extensional effective time than the Standard siRNA.