OGRP stores synteny results from 72 pairwise genome comparisons generated using CollinearScan (X. Wang et al., 2006) and McScanX (Y. Wang et al., 2012). This includes 124,361 blocks and 1,952,225 gene pairs. For each pair of syntenic genes, the nonsynonymous substitution rate (Ka) and synonymous substitution rate (Ks) were calculated. This comprehensive data source allows researchers to easily obtain genomic synteny and nucleotide variation information at the single gene, multiple genes, and whole genome scales.