Most of the research focuses on the Y chromosome as a marker for fetal microchimerism. This does not mean that sons, rather than daughters, uniquely affect their mother’s bodies, but rather reflects ease of measurement: the Y chromosome stands out among a woman’s XX genes. And there is nothing to suggest that the presence of male cells in women’s brains wield a particular influence. Nonetheless, the findings gesture toward an array of questions about what it means for one individual to play host to the cellular material of another, prompting scientists to look into whether this phenomenon affects physical health or influences behavior, or even carries metaphysical consequences.
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