50-100k cells were lysised with 0.1% NP-40, 0.1% Tween-20 and 0.01% digitonin, then incubated with Tagment DNA Enzyme (Illumina) for 30 minutes at 37C. DNA was purified with Qiagen MinElute Reaction Cleanup Kit. Library fragments were amplified using Phusion High-Fidelity PCR Master Mix with HF Buffer (ThermoFisher cat#F531S) and custom v2_Ad1 and v2_Ad2 unique dual indexes (Mezger, et al., 2018, Nat Commun).