Chalcone synthase (CHS) RNA (1.4 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 CHS 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. The soybean CHS genomic clone (pC2H2.0, Gm-b10BB-5) was used as probe.