(A) Expression heat map of genes identified as differentially expressed by microarray analysis. ms1 pistils were left un-pollinated (Un-Poll), or pollinated by either wild-type (W) or myb triple mutant (M) pollen and grown for 8 hours. The genes identified (Locus Identifier) are indicated with the gene name or predicted function (Gene Title). †, Array ID identifies two. The fold change (FC) between wild-type and myb triple mutant pollinations is shown, with asterisks (*) indicating fold changes that were statistically significant (P<0.05). Previously published data from pollen grain development [29], pollen tube growth [19], sperm cells [30], and sporophytic tissues [31] are included for comparison. Pollen development: U, Unicellular; B, Bicellular; T, Tricellular; D, Dry Pollen. Pollen tube: 0.5, 30′ in vitro grown pollen; 4, 4 hour in vitro grown pollen; S, Semi in vivo grown pollen tubes; Sperm, Isolated sperm cells, M - Max sporophytic expression from 7 tissue types.