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@Vader
@Discipulus_Didicit
@WaterPhoenix
@BearMan
Something interesting for you to discuss (though slightly inappropriate):
The Hyūga Clan engaged in regular incest between cousins (if not siblings at some point) to keep their bloodline pure yet no gene-damage was seen either mentally or physically across the generations (in fact they seemed to be getting faster and more agile with their use of the Byakugan eyes).
How is this feasible?