Subtyping of the group specific component in secretions of semen and vaginal fluids is impossible with conventional detection systems. By means of a highly sensitive alkaline-phosphatase secondary antibody system the group specific component can reliably be detected in semen stains. Results with vaginal swabs were inconsistent and in saliva stains Gc activity could not be detected.
Population studies were carried out on German and Turkish individuals from South-West Germany using the short tandem repeat (STR) systems HumFibra (n = 138 Turkish and 1161 German individuals) and HumACTBP2 (n = 202 Turkish and 1338 German individuals). After electrophoresis 19 alleles could be identified for HumFibra and 55 for HumACTBP2. No significant deviations from Hardy-Weinberg equilibrium were observed.
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