1Predicted genes that were not organized into groups using OrthoMCL. We suggest that many
such genes are misannotated, though we cannot rule out genes with unique domain arrangements
that have undergone lineage specific expansion. 2Orthologous groups containing at least one gene
from the indicated species. 3Groups containing putative paralogs from the indicated species, but
lacking genes from other species. Such unassigned homologous groups may contain genes with
ambiguous relationships among species, such as many of the NBS-LRR disease resistance genes
that can evolve by processes such as non-allelic recombination and gene conversion.