Biological activity of the spleen focus-forming virus is encoded by a molecularly cloned subgenomic fragment of spleen focus-forming virus DNA.
Linemeyer DL, Ruscetti SK, Scolnick EM, Evans LH, Duesberg PH. Biological activity of the spleen focus-forming virus is encoded by a molecularly cloned subgenomic fragment of spleen focus-forming virus DNA. Proc Natl Acad Sci U S A. 1981 Mar; 78(3):1401-5.