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A, GUS expression in expanding pinnae of representative F2 segregant plants (<8 mm in length) taken from WT-4, DR5::GUS, and crd-4, DR5::GUS plants (scale bar = 2 mm). B, Mean levels of IAA and IAAsp (C) from apical tissue of WT-4 and crd-4 mutant plants (n = 4, ±se). Asterisks denote a significant difference in means (P < 0.001).
