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Ribonuclease zymograms of seedlings of the F1 progeny from F. vesca 801 by F. nubicola 601, showing independent segregation of RNases A and B. Gels incorporated Pharmalyte 3-10 and separation was by IEF. F. vesca 801 lacks RNases whereas F. nubicola 601 is AB; the seedling classes are AB, A, B or neither. Thus A and B are not allelic and are attributable to two loci (later labelled S and T).
