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Anonymous File :-(, x)
>>59352
Not tumors, tails. Skin, muscles, veins, nerves, sometimes even cartilage and proper vertebrae. All humans have the genes for developing a tail, but usually another gene stops this development early on. If the stop gene fails to function properly, you get a more or less complete tail.
Interestingly, manx cats seem to have a similiar gene that stops tail development.
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