(Received 17 February 1984; accepted 2 April 1984)
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A method is described that increases the sensitivity of detection of group-specific component (Gc) in bloodstains following agarose gel electrophoresis. Gels are stained first with Coomassie Brilliant Blue R250 (CB) and subsequently stained with silver. Double-staining with CB first enhances the sensitivity of the silver stain from 10- to 80-fold over staining with CB alone. The method is reproducible and can easily be incorporated into the laboratory as a routine procedure.
Research chemist, Forensic Science Research Group, Laboratory Division, FBI Academy, Quantico, VA
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