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Three-dimensional structures are now known for roughly half of all protein families. It is thus quite likely, in searching sequence databases, that one will encounter a homolog with known structure and be able to use this information to infer structure-function properties. The goal of Entrez's 3D structure database is to make this information accessible and useful to molecular biologists. To this end, Entrez's search engine provides three powerful features: (i) Links between databases; one maydoi:10.1093/nar/28.1.243 pmid:10592236 pmcid:PMC102448 fatcat:o4lfdvympne35bpwmixhx6wfri