“…The culture media, serum (heat-inactivated by a 30 min incubation at 56°C), the other special chemicals and the animals (male rabbits of the Termonde White Strain, aged 1-2 months) were from the same suppliers as mentioned in our previous studies (Hauser & Vaes, 1978a,b, 1979Huybrechts-Godin & Vaes, 1978). Microtest II culture plates were from Falcon Plastics (Los Angeles, CA, U.S.A.), and Multiwell plates from Costar (Cambridge, MA, U.S.A.).…”