Wild-type and mutant developing seed stained with DMACA. A through I, Pools of developing seed dissected from siliques, including Ws-2, tds1, tds2, tds3-1, tds4, tds5, tds6, tt8-4, and tt7-3, showing DMACA-reacting PA intermediates present in all except tt8-4. Bar = 0.05 mm.