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Nucleoside hydrolytic activities in Arabidopsis thaliana wild-type and mutant plants. Nucleoside hydrolysis was determined in soluble fractions of plant extracts. Data show mean ± SD (n= 3). Significant differences (P < 0.05) between mutant (urh1, pale gray bars; urh2, dark gray bars; urh1 × urh2, white bars) and wild-type (URH, black bars), as determined using unpaired two-tailed t-tests, are marked with an asterisk. URH, nucleoside hydrolase.
