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Fig. 5. Histochemical detection of GUS activity in Pphb7-GUS-1 line. A juvenile gametophore without (A) and with (B) a basal rhizoid protrusion (arrow). (C) A gametophore cultured for 6 weeks on G medium. (D) Epidermal cells of an adult gametophore stem. (E) A mid-stem rhizoid initial cell with protrusion. (F) The apical and subapical cells of a rhizoid with 8 cells. (G,H) Apical parts of a chloronema (G) and a caulonema (H). (I) Gametophores cultured in 10 µM NAA solution for 6 hours. Scale bars: in A, 50 µm for A,B; in C, 1 mm for C,I; in D, 50 µm for D; in E, 25 µm for E; in F, 100 µm for F; in G, 50 µm for G,H.