b6 -- -- ak chimeras , prepared with b6 bone marrow deprived of thy-1,2-positive cells prior to allogeneic transplantation and kept in laminar flow isolation , did not develop graft-versus-host reactions , lived long lives ( observations carried up to 13 months ) , failed to develop leukemia-lymphoma , and had persistently low levels of lipid-bound sialic acid .
C0005953
bone marrow
C0023418
lymphoma