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Turns out, biological sex determination in mice is kind of an ongoing battle. It doesn’t end during fetal development. It doesn’t even end at birth.

For now, the main thing we can take away from this discovery is a gentle reminder that our bodies really are weird and wonderful. Even if you’re already used to thinking about gender as a fluid concept, it can be strange to realize how flexible biological sex is, as well. Don’t get too hung up on the idea that “male” and “female” must be set-in-stone categories. Nature certainly doesn’t treat sex that way.