Volume 26, Issue 2 (April 1981)

    The Evidential Value of Peptidase A as a Semen Typing System

    (Received 13 June 1980; accepted 17 October 1980)

    Published Online: April


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    Human erythrocyte peptidase A (Pep A) displays a genetic polymorphism in blacks. Its occurrence in human semen was examined for its possible use as a semen typing system. Studies by starch gel electrophoresis, in which the Pep A was located by an improved method, were carried out on semen, semen stains, and vaginal swabs taken at known times after intercourse. In addition, a large number of vaginal swabs, negative for semen, were taken from females throughout their menstrual cycles and examined for Pep A activity. The results indicated that Pep A typing could be carried out on semen and semen stains. However, it was possible to determine the Pep A type on vaginal swabs only when they had been taken within about 3 h after intercourse.

    Author Information:

    Parkin, BH
    Principal scientific officer, head of Body Fluid Grouping, The Metropolitan Police Forensic Science Laboratory, London,

    Stock #: JFS11375J

    ISSN: 0022-1198

    DOI: 10.1520/JFS11375J

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    Title The Evidential Value of Peptidase A as a Semen Typing System
    Symposium , 0000-00-00
    Committee E30