The GmCons promoter family refers to a subset of putative reference genes that were evaluated for uniformity of expression stability under different conditions (as described in: M. Libault, S. Thibivilliers, D. D. Bilgin, O. Radwan, M. Benitez, S. J. Clough, and G. Stacey (2008) Identification of four soybean reference genes for gene expression normalization. Plant Genome 1:44-54). Of the 18 genes selected for extensive analysis, the following 4 were classified as "reference genes" for expression analyses: Cons4, annotated as an ATP-binding cassette [ABC] transporter; Cons6, F-box protein; Cons7, metalloprotease (promoter not cloned); Cons15, CDPK-related protein kinase (promoter not cloned).