| Function | Description |
| xtrhomology | Contains data for genes that are homologous to genes in Xenopus tropicalis |
| xtrhomologyDATA | Genes that are Homologous to Xenopus tropicalis |
| xtrhomologyHGID | A vector containing all the HomoloGeneIDs for Xenopus tropicalis |
| xtrhomologyLL2HGID | Mappings between public database ids and NCBI's Internal HomoloGeneIDs for Xenopus tropicalis |
| xtrhomologyORGCODE | A data frame for mappings between organism scientific names, NCBI code, and three-letter short names for various organisms |
| xtrhomologyQC | Quality control information for xtrhomology |