Price P J, Arnstein P, Suk W A, Vernon M L, Huebner R J
J Natl Cancer Inst. 1975 Nov;55(5):1231-2. doi: 10.1093/jnci/55.5.1231.
Several types of tumors from various species were propagated in NIH athymic nude mice. Subsequently, cell lines were established from the tumors and examined for evidence of type-C virus activity. Hybrid mice (NIH Swiss and BALB/c) harbored murine type-C viruses of three categories: N-tropic, B-tropic and X-tropic.