61.   They checked for evidence of cell division by looking for a protein present when cells are dividing.

62.   This allows the cells to divide endlessly.

63.   In normal cells, telomeres shorten a little every time the cell divides, eventually becoming so short that chromosomes can no longer divide and the cell line dies.

64.   They will find out next week whether the cells divided, enabling them to then implant the fertilised egg into a cow.