Substitution of leucine for isoleucine in a sequence highly conserved among retroviral envelope surface glycoproteins attenuates the lytic effect of the Friend murine leukemia virus.
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M. Sitbon | S. F. Hayes | P. Tambourin | K. Wehrly | J. Nishio | S. Perryman | L. d'Auriol | C. André | F. Pozo | H. Ellerbrok