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using template DeWitte etal 2007
|accessdate=2019-10-20
}}</ref> which is a very important non-antibody protein that generates immune response when in contact with specific agents. Plasma cells which increase in number in response to pathogens levels, secrete immunoglobulin.<ref name="flower1983"/>
It is also very important to note that [[Langerhans cells]] that are present in the foreskin produce ''Langerin'', a substance that has been proven to kill human immunodeficency virus ([[HIV]]) on contact.<ref>{{REFjournal |last=de Witte |init=L |last2=Nabatov |init2=A |last3=Pion |init3=M |DeWitte etal=yes |url=http://www.cirp.org/news/healthday2007-03-05/ |title=Langerin is a natural barrier to HIV-1 transmission by Langerhans cells |journal=Nat Med |date=2007-03 |volume=13 |issue=3 |pages=367-371 |accessdate=2019-10-20}}</ref>
All of these function to sequester and “digest” foreign pathogens. All these substances play an important role in protecting the penis from viral and bacterial pathogens. The immunological functions of the human prepuce have been extensively documented by respected researchers for quite some time.<ref name="fleiss-hodges-vanhowe1998">{{FleissP HodgesF VanHoweRS 1998}}</ref>