iPOND Mass spectrometry (iPOND-MS) was performed to identify replication fork proteome in wild type (WT) and ABARAXAS KO (ABX KO) HEK293T cells treated with 1 µM CPT in combination with 250 nM ATM inhibitor (AZD0156). An additional set of control cells were kept for no-click (NC) negative control. The experiment was done with 5 repeats and the samples were designated as: WT/1, WT/2, WT/3, WT/4, WT/5, ABX KO/1, ABX KO/2, ABX KO/3, ABX KO/4, ABX KO/5, NC/1, NC/2, NC/3, NC/4, NC/5.