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To save time , evaluate the books , articles , and web sites you find to be sure they are relevant to your research topic . This aspect alone is a sharp deviation from the normal intelligence modus operandi that will have to shift from the current need to know mentality toward a need to share collaborative environment . Using AND and OR will instruct the database to retrieve everything with either term for concept 1 that also includes either term for concept 2 . As a result of different perceptions of the threat , both sides of the Atlantic take divergent approaches to homeland security . Because of it potential in preventing tumorigenesis we turned our attention to it description in situ in mouse mammary epithelium .