 The CTL lines were made at Baylor College of Medicine from donors for other transplant patients or other normal donors from the National Marrow Donor Program. All donors were screened in the same way as blood donors. When the CTL lines were made, blood was taken from the donors and used to grow T cells. To do this, we first infected a type of blood cells called monocytes with a specially produced adenovirus gene that also carries part of the CMV gene. The monocytes with these new genes then stimulated the T cells. This stimulation trained the T cells to kill cells with this part of the CMV virus or with adenovirus. 