Arabidopsis is a model plant for the study of seed biology and oilseed metabolism. To profile the developmental expression of proteins during seed filling, Arabidopsis seed was analyzed using two-dimensional Difference Gel Electrophoresis (DIGE) at 5, 7, 9, 11, and 13 days after flowering. Two-dimensional gel reference maps are now available for proteins with pI values from 4 to 7 (gel pI 4-7) and pI 3-10 (gel pI 3-10). An alternative viewing option is the functional classification table (Protein table) or nested table (below). Proteome reference maps contain clickable spots linked to expression profiles and protein identification data. Details on expression data are also available for all 5 stages.