Flavonoid 3'-hydroxylase (F3'H) RNA (1.8 kb) profile. Measurements made at 8 intervals through a 53 hr period in response to infection by Pseudomonas syringae pv glycinea with avrB (avrB) or without (vir) (First and second panels respectively). Third panel is the F3'H RNA profile in response to infiltration with control medium (MgCl2). Dark background sub-panels are the 25 S ribosomal RNAs from corresponding ethidium bromide-stained gels prior to membrane transfer and shown to compare sample loading. Gm-c1019-10961 soybean cDNA clone was used as probe.