Invertase inhibitor/pectin methylesterase inhibitor (INVINH/PMEI) homologs from rice identified as expressed during caryopsis development using microarray data accessed via PLEXdb [14] from experiment accessions OS5 “Expression data for reproductive development in rice” [26], OS8 “Expression data from rice embryo, endosperm, root, leaf, and seedling” [21], OS16 “Genome-wide gene expression profiling of rice stigma” [27], OS44 “Rice expression atlas (3): Early embryogenesis” [28], and OS89 “Expression data from rice embryo and endosperm development” [29].