PTPRC and neoplasm: When we co-implanted individual lineage cells such as CD3+ (T cells), B220+ (B cells), Mac-1+ (monocytes), Gr-1+ (granulocytes), or Ter119+ cells (red blood cells) with LL2 cells, we found their tumor-promoting effects were not as potent as LSK cells or total BM cells (data not shown).