Can twins run in the family?

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Tags

  1. #fertilized
  2. #however
  3. #fraternal
  4. #twins
  5. #genetics
  6. #pregnancy
  7. #happen
  8. #families
  9. #instead
  10. #matter
  11. #genetic
  12. #having
  13. #mother
  14. #identical
  15. #given
  16. #other
  17. #simultaneously