library_construction_protocol: cells sorted by CD3+ CD4+ CD45.1+ TCR-Vb6+ CD62L+ CD44- CD25-, activated by a-CD3/CD28, a-IFNg, and a-IL-4 for 2days, and transfected with retrovirus with pST-sgRNA for 3days, CD90.1 positive activated T cells were sorted, and extract DNA 20 mg of genomic DNA from the naïve, activated, and inflammatory T cells was fragmented to be 300 bp in size by sonication. DNA fragments were applied to a Bst polymerase 3.0 (NEB) mediated one-round of liner primer extension with a biotinylated primer targeting the on-target site in the first intron of c-Myc. After that, the excessive biotinylated primers were removed by AxyPrep Mag PCR Clean-Up beads (Axygen). DNA was denatured at 95℃ for 5 min, immediately chilled on ice for 3 min, and incubated with Dynabeads MyOne Streptavidin C1 (Thermo Fisher) for 2-4 hours. The C1 beads were thoroughly washed by 1x B&W buffer (5 mM Tris-HCl, pH 7.4; 1 M NaCl; 1 mM EDTA), 10 mM NaOH, 10 mM Tris-HCl, and then subjected to be ligated with a bridge adapter containing random molecular barcodes. After overnight incubation, the ligated DNA on C1 beads was thoroughly washed by 1x B&W buffer and 10 mM Tris-HCl, and tagged with Illumina adapter sequences. DNA ranging from 300-700 bp were recovered and sequenced on a Hiseq platform (2 x 150 bp).