cytosols were prepared from tk- and tk+ cells and evaluated for tk activity using an assay which is based on the phosphorylation of [ 125i ] -iododeoxyuridine , [ 125i ] -iododeoxycytidine , or [ 3h ] thymidine and the precipitation of the monophosphates of these nucleosides by lanthanum chloride .
C1383501
cytosols
C0007634
cells