Unexpectedly, after 72 h of co-culture, we detected a considerable fraction of macrophages (CD45+ cells, Figure S3C) retaining mCherry (detected as GFP-neg mCherry+ events by FCM) in the co-culture condition with cancer cell lines transduced with the non-cell permeant mCherry version (i.e., lacking the sLP; Figures 3B and S3D). Here, PTPRC is linked to cancer.