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Fig. 9. Tannins in the sub‐apical pith parenchyma. Precipitates of tannins stained pink. A, Globular and vacuolar polyphenols in vacuolate pith cells adjacent to the rib meristem. B, Vacuolar polyphenols in vacuoles of pith parenchyma cells. gp, Globular polyphenols; vp, vacuolar polyphenols.
