Larson (1967), using acrylamide gel electrophoresis, described two seed proteins in soybean seed and noted they were variety specific. The inheritance of these proteins (although the proteins were not characterized) was reported as being controlled by two codominant alleles at a single locus (Larsen and Caldwell, 1968); gene symbols were not assigned. The letters "A" and ''B'' were used to designate the two different seed protein bands.