myeloid leukemia cell line M-1 myeloid leukemia cell BTO:0002037 BrendaTissueOBO M-1 cell M1 cell Mouse myeloid leukemia cell line. Origin: bone marrow from SL mouse with spontaneous myeloid leukemia was injected into isogenic mice and the cell line was established from the ensuing hyperplastic lymph nodes 14 days later by recloning on soft agar; homotransplantable and forms colonies on soft agar (granulocytic/macrophage differentation inducible by IL-3, LPS or dexamethasone).