Human saliva was analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and the response to different natural stimuli investigated. Serva Blue R revealed pink/violet-staining proteins ("lumicarmines"). These intensified following stimulation but in an unpredictable and sometimes disproportionate manner, causing pattern changes. This variable response undermines their potential forensic value for suspect identification.
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Märshall et al. (1989) studied this question.
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