Laboratory mice whose p53 genes had been switched off developed tumours.
When their p53 genes were switched on again, the tumour cells stopped dividing and died within a few days. Healthy cells in the mice were unaffected.
What do these observations suggest?
1 )
p53 protein speeds up the mitotic cell cycle
2 )
p53 protein causes all cells to die
the p53 gene acts as a tumour suppressor gene
4 )
the p53 gene encourages the growth of tumours
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