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Mon, 22 Jun 1998 13:07:40 EDT Barbara Brock <[log in to unmask]> wrote: <<<< What I don't get is why scientists are concerned about cross-species viruses, etc., when they've been using porcine valves for years. Can someone explain?>>>> Hello Barb, I do not know of what tissue porcine valves consist, but in the case of the "pig-cell" implant the tissue consists of fetal tissue. Therefor these cells are multiplying very fast and are copying the DNA-structure. Some virusses can attach to DNA, so when the cells multiply, the virusses multiply too, meanwhile disturbing the correct copying and causing mistakes in the next generation cells' DNA structure. Also see Joe Bruman's posting last Sunday: "Jim Finn on 60 minutes". Greetings, Hans.