See the links at: http://131.158.21.51/afrriwhit/immunol.html ----------------------------------------------------------- Mark H. Whitnall, Ph.D., Armed Forces Radiobiology Research Institute, Bethesda, MD 20889-5603 tel: (301) 295-0277 fax: (301) 295-0313, whitnall at vax.afrri.usuhs.mil http://131.158.21.51/