1. Albritton, L. M., Tseng, L., Scadden, D., and Cunningham, J. M. (1989) A putative murine ecotropic retrovirus receptor gene encodes a multipe membrane-spanning protein and confers susceptibility to virus infection. Cell 57, 659–666.
2. Moloney, J. B. (1960) Biological studies on a Lymphoid-leukemia virus extracted from Sarcoma37. I. Origin and introductory investigations. J. Natl. Cancer Inst. 24, 933–951.
3. Moloney, J. B. (1960) Properties of a leukemic virus. Natl. Cancer Inst. Monogr. 4, 7–38.
4. Hartlet, J. W. and Rowe, W. P. (1976) Naturally occurring murine leukemia viruses in wild mice: Characterization of a new “amphotropic” class. J. Virol. 19, 19–25.
5. Luciw, P. A. and Leung, N. J. (1992) Mechanisms of retrovirus replication. in The Retroviridae, Plenum Press, New York.