Heinl S., Töllner L., Ferko B., Ernst W. and Grabherr R.: Generation of a polyclonal antiserum against Nef, a highly conserved regulatory protein of human immunodeficiency virus with the capacity of eliciting specific CTL response. Joint Annual Meeting of the nnual Meeting of the AAGGE,OEGM, OEGBT and ANGT, Graz, Austria, Sep. 2003.