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The critical need for better tracing of lineage in scientific databases is well known  . It is clear that performance is not an issue for most domain scientists -rather the functionality is more important. In this paper, we highlight the importance of maintaining multiple versions of data and tracing fine-grained lineage in support of these needs. We study alternatives for managing versions, and propose a model for the example application of protein annotations. We present query rewritingdoi:10.1109/bibe.2007.4375599 dblp:conf/bibe/ZhangKP07 fatcat:jflnzvi64vgzrogtr7kvywfme4