- The cytotoxicity of alkyl-lysophospholipid on clonogenic leukemia cells and on normal bone marrow progenitor cells is highly, but differentially, increased by cryopreservation. Verdonck, L.F., Heesbeen, E.C., van Heugten, H.G., Staal, G.E., Rijksen, G. Bone Marrow Transplant. (1992)