Two isozyme variants of seed urease are present in soybeans. These variants are referred to as electrophoretically fast and slow on polyacrylamide gels (Buttery and Buzzell, 1971; Polacco and Havir, 1979). Kloth and Hymowitz (1985) demonstrated that the urease isozymes are codominantly inherited. They assigned the gene symbol Eul-a to the slow-moving allele and Eul-b to the fast-moving allele.
Mervosh, T. L. and Hymowitz, T.
"Research Notes : United States : Screening of the USDA Glycine soja collection for urease variants,"
Soybean Genetics Newsletter: Vol. 14
, Article 64.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol14/iss1/64