Assertion: gene's mutation | /r/AtLocation | case
Facets:
Source sentences:
text: In some cases, the mutation occurs in a person’s egg or sperm cell but is not present in any of the person’s other cells.
text: In other cases, the mutation occurs in the fertilized egg shortly after the egg and sperm cells unite.
text: In some cases, the mutation occurs in a person’s egg or sperm cell but is not present in any of the person’s other cells.
text: In other cases, the mutation occurs in the fertilized egg shortly after the egg and sperm cells unite.