Fig. S1 The effect of isoxaben on primary root elongation of thanatos (than) heterozygous seedlings.

Fig. S2 Cytochemical localization of lignin in thanatos (than) genetic segregants.

Table S1 Oligonucleotides used for positional cloning of the thanatos (than) locus

Table S2 Oligonucleotides used for quantitative real-time PCR assays

Table S3Arabidopsis thaliana cellulose synthase (CesA) mutant alleles

Table S4 Plant and nonplant cellulose synthase 3 (CesA3) homologs and members of the Arabidopsis thaliana Csl family

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