- Appearance of cytotoxic antibody to viral gp70 on feline lymphoma cells (FL-74) in cats during ex vivo immunoadsorption therapy: quantitation, characterization, and association with remission of disease and disappearance of viremia. Liu, W.T., Engelman, R.W., Trang, L.Q., Hau, K., Good, R.A., Day, N.K. Proc. Natl. Acad. Sci. U.S.A. (1984)