effect of thymidine on uptake , dna alkylation , and dna repair in l1210 cells treated with 1,3-bis ( 2-chloroethyl ) -1-nitrosourea or 3'- [ 3- ( 2-chloroethyl ) -3-nitrosoureido ] -3'-deoxythymidine .
C1158483
dna alkylation
C0012899
dna repair