Which changes in a group of mammalian cells, dividing by mitosis, would be necessary for the formation of a tumour?
1) Mitosis is no longer inhibited by cell to cell contact.
2) Cells acquire the ability to migrate and set up new colonies.
3) Cells become able to divide indefinitely.
1 )
1 and 2
1 and 3
3 )
1 only
4 )
2 and 3
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