Integrated research field related to biometals and in symbiosis with genomics and proteomics. In metallomics, metalloproteins, metalloenzymes and other metal- containing biomolecules are defined as ‘‘metallomes’’, in a similar manner to genomes in genomics as well as proteomes in proteomics. In the study of metallomics, elucidation of the physiological roles and functions of biomolecules binding with metallic ions in the biological systems should be the most important research target. Then, metallomics may be called, in another words, ‘‘metal-assisted function biochemistry’’.