There is a weirder case. You can be your own twin if your mother was using certain fertility things. The doctors make sure a couple of eggs are out. Two bumped together and grew as one child. So you could have two sets of DNA inside of you, and the less prevalent set can cause trouble.
That can happen with fraternal twins because with fraternal twins two eggs are available for fertilization and as such they can be fertilized by two different men
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