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Genomic databases are heterogeneous in nature. This means, they have different notations, formats and terminologies for the same kind of data. To overcome the problems due to the heterogeneous and disperse nature of these databases, two main data integration approaches are used i.e. Mediator-based approach and Data warehouse approach. Systems developed using these approaches allow biologists read-only access of data. At times, they need to submit their own generated data during experiments to databases which is not possible with existing systems. In this paper, we design and develop data warehouse based system which not only allows biologists and researchers to access data but also to submit data they generated during lab experiments