Characterization of developing Arabidopsis seeds. A, Seeds staged at 5, 7, 9, 11, and 13 DAF. B, FA content of developing seeds as determined by GC-MS analysis of methyl ester-derivatized FAs using heptadecanoic acid as the internal standard. FAs are expressed on a seed fresh weight basis. C, Protein content of developing seed as quantified by the Coomassie dye binding assay. [See online article for color version of this figure.]