Expression profiling and classification of wheat F-box genes. K-means clustering of average log2 transformed reads per kilobase of transcript per million mapped reads (RPKM) values at different wheat developmental stages. Stage 1 (leaf; three leaves emerged, Z13), Stage 2 (leaf; main stem and four tillers present, Z24), Stage 3 (leaf; tip of ear just visible, booting stage, Z51), Stage 4 (spikelet; beginning of anthesis stage, Z61), Stage 5 (spikelet; early milk development stage, Z73), Stage 6 (spikelet; early dough stage, Z83), and Stage 7 (spikelet; hard grain stage, Z91) are shown. Z, Zadoks growth scale.