Subsetting comparison of UniGene and d2_cluster. Cluster equivalence means that all elements in one cluster are also present in the other cluster, and vice versa. Out of 14,989 (= 15,226 − 237) original UniGene clusters and 13,755 d2 clusters, 12,389 (or 83% of UniGene clusters and 90% of d2 clusters) are equivalent. Two hundred thirty-seven UniGene clusters were not considered in the analysis because they were composed of sequences that were screened out in our vector and repetitive elements screening stage.