van den Berg F M, Walboomers J M
Intervirology. 1981;16(3):184-90. doi: 10.1159/000149266.
A physical map was constructed of a cotransformed 3T3 thymidine kinase (tk) negative cell line revealing a close linkage of the selectable herpes simplex virus type 2 tk gene and cotransfected simian virus 40 DNA sequences in high-molecular-weight cellular DNA.