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Distribution of Cd concentration in grain in 312 rice accessions and comparisons of Cd concentration in grain between subspecies and between subgroups. a, Distribution of Cd concentration in grain of 312 rice accessions. b, Comparison of Cd concentration in grain between indica and japonica species. c, Comparison of Cd concentration in grain between Temperate and Tropical japonica. *** and ** represent significant difference at p < 0.001,and p < 0.01 in t-test
