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It has been proposed that differentially-expressed genes,aside from genetic variations affecting protein processing and functioning,between hybrid and its parents provide vital candidates for heterosis or hybrid vigor.Our previous work analyzed the potential effects of gene-expression difference on the heterosis of rice,based on serial analysis of gene expression (SAGE) data annotated with available full-length cDNA from an elite Chinese super-hybrid rice (LYPg) and its parental cultivars (93-11 and PA64s) in three maior tissue types at three different developmental stages.