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Boku no Hero Academia

No.181885719 ViewReplyOriginalReport
Hori gave us a major drop that rats/mice were the first ones to ever exhibit quirks and mutations.

Mice are used in research and development due to them having 98% of the same DNA genome as humans. If quirks originated from government experiments on them the quirk virus or disease could have easily been transfered to humans in theory. Nezu is a prime example of this as in his backstory he's said to have been a victim of human experiments on him. If anyone can add to this feel free