1. Removal of PHA from super-natants containing T cell growth factor;Alvarez;J Immunol Methods,1981
2. The phylogenetic con-servation of cytokines;Cohen,1991
3. Axolotl immunology: lymphocytes, cytokines, and alloincompatibility reactions;Cohen;Axolotl Newsletter,1994
4. Cytokines: Intercellular messen-gers of proliferation and function;Dugan,1994
5. The immune system of Xenopus;Du;Annu Rev Immunol,1989