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The B-class gene PI is misexpressed in the outer whorl of tpl-1 and hda19-1 mutant backgrounds. (A-F) PI in situ hybridizations. (A,B) Stage 4 and (C-F) stage 7-8 Arabidopsis flowers. (A,C) PI is not expressed in whorl 1 organs in either stage of floral development. (B,D-F) PI is ectopically expressed in mutant whorl 1 organs (arrowheads). Scale bars: 50 μm.
