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Structures of three expansin cDNAs cloned from petals of opening carnation flowers. Light shaded rectangle, signal peptide; dark shaded rectangle, active site motif; filled circles, cysteine residues; filled ellipsoid, tryptophan residue; open diamond, ATG start codon; inverted open triangle, TGA stop codon; dark shaded inverted triangle, TAG stop codon; light shaded inverted triangle, TAA stop codon.
