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" ... Intercept’s mechanism is elegantly simple: a proprietary molecule called amotosalen HCl is added to platelets and plasma and then activated by ultraviolet light. The molecule then gets to work by basically unzipping any RNA and DNA in the sample, whether it’s in a virus, bacterium, parasite, white blood cell or any other substance. Then it crosslinks the nucleic acids – zipping back up the DNA or RNA crookedly – which prevents replication and inactivates the pathogens. For red blood cells, a different activation is used because light does not pass through hemoglobin. Instead, tweaking the pH activates a different proprietary molecule called S-303, which then does the same nucleic acid crosslinking. ... "