The actual mutation can be found in the Gangland Shopping Mall. You will want to go all the way north until you get to the very back of the Mall. Then go west into the Mens Section, beware for there are a few zombies that won't give you much trouble; unless you do not have experience with this type of enemy.
This mutation grants:
+2-4 slash resistance +1-3 stab resistance
A moderate amount of slash and stab soak, both of which are common damage types.
Takes up a soak slot.
She/he has patches of scales on his/her skin.