Abstract -------- :Authors: Diane Trout, Brandon King The purpose of BioHub is to provide a queriable database that allow multiple annotations to be attached to a specific region of a genome. We intended that BioHub provide a way to link diverse annotation sources, by mapping identifiers in foreign databases to our unique identifier. The core of BioHub provides a way to define a unique sequence ID (SID) that describes a specific genome, build, and chromosome start, stop and strand with the guarentee that the same region will always receive the same SID. The SID then allows us to link a variety of specialized annotation databases with a single linking table. We were then able to provide a Python interface to this database to provide such useful services as: a "spatial query" that can search the upstream or downstream region of a specific genome feature (identified by its SID) for features of interest; large batch BLAST and BLAT queries; and sequence retrieval. BioHub was written by Brandon King, Joe Roden, Cory Tobin, Matthew Goldsbury, and Diane Trout