Integration of life science databases scattered around Japan used to be tackled by individual related ministries. In order to make this an all-nation task, four ministries in Japan, MEXT, MHLW, MAFF and METI, started systematic inter-ministry collaboration in FY2011, and have been promoting database integration through the four steps: database catalog, cross-search, archiving and restructuring. This article introduces the current state of these four steps, and mentions issues in each step, such as data sharing and RDFizing.
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