Functionality for manipulating KEGG annotations.

KEGG is a bit hard find, but there exist species-specific tables Available organisms are listed in the table at

ftp://ftp.genome.jp/pub/kegg/genes/etc/all_species.tab

Data for each organism is stored its own subdirectory under

ftp://ftp.genome.jp/pub/kegg/genes/organisms/

Containing tables linking everything -- including external resources like UniProt, PDB, or NCBI -- together.