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These results clearly indicate that the cell lines TSU-Pr1 and JCA-1 are not of prostatic origin but are derivatives of the bladder carcinoma cell line T24 . The patients were evaluated periodically for 1 year after the procedure before they learned whether or not they had received the cell implant therapy . If DNA has been damaged , as can occur during DNA replication and cell division or as a result of an environmental injury , the gene receives a signal that it should halt the cell 's cycle of growth . An energy field served as the cell 's door , allowing security personnel full view of any prisoners . Most cancers have mutations in the signals that regulate the cell 's cycle of growth and division . " Bcl-2-related proteins regulate the cell 's fate by a variety of mechanisms , " Siler-Marsiglio wrote us .