The authors discuss the problem of selective derivation of the genetic material of spermatozoa for molecular genetic identification from mixed biological traces containing sperm on material evidence. Possible methods of improving the efficacy of differential lysis of cells present in mixed traces are analyzed. Effects of some routinely used extractants on biological substrata, most often contaminating the sperm in expert material, have been studied, and conditions for their most complete elimination from objects of investigation optimized.
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