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CRE1 and RR1 Are Expressed in the Pericycle of Uninoculated Roots.
RNA in situ localization of CRE1 (A) and RR1 (B) is shown in the susceptible zone of uninoculated roots. For in situ hybridization, root tips of ∼1 cm of 4-d-old seedlings were used. Hybridization signals are visible as red dots (arrowheads). C4 and C5, cortical cell layers 4 and 5; ed, endodermis; ep, epidermis; pc, pericycle; vb, vascular bundle. Bars = 50 µm.
