these hybrids were constantly maintained in hat selective media in order to select for the presence of the human thymidine kinase gene on the intact chromosome 17 ( 17q21 -- -- 22 ) or the 17/20 ( 17pter -- -- 17q25 : :20q13 -- -- 20qter ) translocation chromosome .
C1520789
17q25
C0008633
chromosome