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Thanks, that's what I thought but I can't find any literature to say that about R1 and R2 being able to produce f. The only thing mentioned is R1R2. Can you tell me where I can find it?

Can an R1R1 or R2R2 person make anti-f? they should since they are negative for f? We have what looks like anti-c in gel, both with untreated and ficin-treated cells but tube screen is not reacting w/R2R2 cells and one gel panel looks like f, while the other gel panel looks like-c.