HP Custom siRNA is an siRNA synthesis option that provides for specific siRNA requirements, including siRNA for multiple species, specific splice variants, and non-human, -mouse, and -rat genes. HP Custom siRNA provides highly pure siRNA in 20 nmol amounts. Available fluorescent labels include Alexa Fluor 488, Alexa Fluor 546, Alexa Fluor 555, Alexa Fluor 647, Cyanine 570, Cyanine 670, fluorescein, and rhodamine dyes. Modification options include amino linkers, thio linkers, and biotin, dabcyl, and phosphate modifications.