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. 2018 Feb 14;9:150. doi: 10.3389/fpls.2018.00150

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Copyright © 2018 Estornell, Landberg, Cierlik and Sundberg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Histochemical analysis of promoter activity of STY1 targets through anther development. (A–E,P–T) PAO5pro:GUS, (F–J,U–Y) EOD3pro:GUS and (K–O,Z–DD) PGL1pro:GUS activity visualized as blue staining in cross-sections of floral buds (stages 1–2 and 3–4) and microsporangia (stage 5–12). Numbers in PAO5pro:GUS microsporangia cross-sections indicate anther stages. (A,F,K) Stage 1–2. (B,G,L) Stage 3–4. (C,H,M) Stage 5. (D,I,N) Stage 6. (E,J,O) Stage 7. (P,U,Z) Stage 8. (Q,V,AA) Stage 9. (R,W,BB) Stage 10. (S,X,CC) Stage 11. (T,Y,DD) Stage 12. Letters indicate floral parts or their primordial equivalents, St, Stamen; G, Gynoecium; Sp, Sepal; N, Nectary. Bars at stages 1–2 and 3–4 = 20 μm. Bars at stages 5–12 = 10 μm.