- The biological activity and immunotherapeutic properties of AS-101, a synthetic organotellurium compound. Sredni, B., Caspi, R.R., Lustig, S., Klein, A., Kalechman, Y., Danziger, Y., Ben Ya'akov, M., Tamari, T., Shalit, F., Albeck, M. Nat. Immun. Cell Growth Regul. (1988)