In the wrong direction (male fetus to mother, not sure they tested the other direction), but... http://onlinelibrary.wiley.com/doi/10.1634/stemcells.2004-0169/f

In the wrong direction (male fetus to mother, not sure they tested the other direction), but... http://onlinelibrary.wiley.com/doi/10.1634/stemcells.2004-0169/full http://onlinelibrary.wiley.com/doi/10.1634/stemcells.2004-01... "The male cells were found almost exclusively in Block 1, corresponding largely to the olfactory bulb." Now this is starting to be interesting!