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On the cover: Histochemical staining for in planta activity of alkaline phosphatase (AP) in strain MDM1.1688/sti2. A cross section of corn stem was stained for AP activity with substrate NBT-BCIP. Development of brown color, corresponding to active AP, was visible on the wall of the protoxylem in the vascular bundle. For the article of Uratani et al., see page 892.