A metabolic pathway database which is able to overlay gene-to-gene and/or metabolite-to-metabolite relationships as curves on a metabolic pathway map, or on a combination of up to four maps. This representation would help to discover, for example, novel functions of a transcription factor that regulates genes on a metabolic pathway. You can upload your own data (experiment data, map data and correlation data) for analyses. Other users never allowed to access to them. After logging-off, leaving from KaPPA-View4 site, or closing the browser, all the uploaded data are to be deleted from the server.