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SINTEX is only interested now, as Sloan-Kettering has been working much faster and has both leukocyte and fibroblast interferon cloned, in cloning immune. Now, whether they'll get a clone first or not, I don't know. I'm not sure that they've put enough money and attention on it. Burns is really interested in the whole interferon subject at Roche, and they have the money and the will to do it, and he has been given the go-ahead by the management of Roche in Switzerland to go ahead and do it.

I think for the sake of the record you might tell me the basic difference between these different types of interferon as they now see them.

Well, leukocyte interferon comes from leukocyte in the blood, and fibroblast interferon comes from fibroblasts of the blood, and immune interferon comes from cells in the blood. So they're all from different elements of our blood, all of which evidently are protective of us against viruses and have something to do with preventing Cold fluvirus cells from multiplying. They control mitosis. I mean interferon seems to have control of mitosis in some degree. Now, maybe one type of interferon has more control of certain cells than others, and this is like a big forest that we're not in beyond a tenmile edge.