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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Perhaps I could find this answer somehow on Google, but I know we have some biology hipsters here, Anders and several others.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have been thinking along the lines of the every-cell-a-3Giga-yr-old-organism notion. I don’t know, but I have a line of reasoning that leads to a startling conclusion.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]> Stem cells create new tissue at the site of an injury, such as a scar on the skin or at the interface between damages surfaces of broken bone.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The stem cells get to the damage site by some means.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>It must be they are carried there by the blood.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>So there must be stem cells in the blood stream always. So far so good?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Sperm regenerates constantly. Reasoning: I have been losing those things regularly for a lot of years, yet have never run out.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Like any other cell, sperm must come from stem cells.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>7.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I would assume one particular stem cell becomes one particular sperm cell.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>8.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The stem cells must get to the testes from the bloodstream.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>9.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Tissue from a donor, with unmatched DNA, can be incorporated into the body of a recipient, such as a transplanted kidney, for instance.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>10.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>If a patient receives donor blood, that recipient is getting a bunch of donor stem cells as well.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>11.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>If a patient needs blood and receives a unit, at least for a short time the number of stem cells in the bloodstream of the recipient may reach 10% or more from the donor.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>12.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Some fraction of these would make their way to the testes, and create sperm cells with the donor’s DNA.<o:p></o:p></p><p class=MsoListParagraph><o:p> </o:p></p><p class=MsoNormal>If this line of reasoning holds, and I can’t think of any reason why it wouldn’t, or any step in the above line of reasoning that is incorrect, then donating blood introduces some chance of the donor having biological offspring, having never actually copulated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>spike <o:p></o:p></p><p class=MsoListParagraph> <o:p></o:p></p></div></body></html>