Mutations may occur in a normal cell as a result of cell division and the effects of environmental and lifestyle factors, such as smoking o r sunlight. Once the first cancer-causing, or driver, mutations occur, defects in cellular processes âfor example, in DNA repairâmay cause more mutations to occur.
U.S. men's national soccer team coach Jurgen Klinsmann out. U.S. men's national team coach Jurgen Klinsmann has been under increased pressure.
David de Gea is back in first-team training for Manchester United, but Sergio Romero looks set to continue between the posts. David de Gea trained with Manchester United's first-team squad on Saturday despite being left out of Friday's 1-0 win at Aston Villa.