- Identification of a novel bone marrow-derived B-cell progenitor population that coexpresses B220 and Thy-1 and is highly enriched for Abelson leukemia virus targets. Tidmarsh, G.F., Heimfeld, S., Whitlock, C.A., Weissman, I.L., Müller-Sieburg, C.E. Mol. Cell. Biol. (1996)