immune tolerance in pregnancy
... that secretions from the placenta prevent the maternal immune system from recognizing the fetus as a foreign object, partly explaining immune tolerance in pregnancy?
... that secretions from the <a href="./Placenta" id="mwE3o" rel="mw:WikiLink" title="Placenta">placenta</a> prevent the maternal <a href="./Immune_system" id="mwE3s" rel="mw:WikiLink" title="Immune system">immune system</a> from recognizing the fetus as a foreign object, partly explaining <b id="mwE3w"><a href="./Immune_tolerance_in_pregnancy" id="mwE30" rel="mw:WikiLink" title="Immune tolerance in pregnancy">immune tolerance in pregnancy</a></b>?