(???,???? ???? ?, ???? ??? ???? ??? ? ? ?? ??? ?? ????.The S stage only begins when the mobile has handed the G _ one  checkpoint and has grown enough to comprise double the DNA. S period is halted by a protein referred to as p16 till this takes place.?????? ??? ????? ??? ??? ???? ???? ??? ?? ????? ??? ?? ????. ??, ?????? ??? ? ?? ??? ??? ?? ??? ?

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