The Allen Brain Atlas is a collection of public online resources integrating extensive gene expression and neuroanatomical data. It is especially rich in resources relating to human and mouse neuroscience, but also includes some resources on non-human primates. The Allen Brain Atlas API consists of a set of URLs that make most of the data behind the project available for download.
The Allen Institute for Brain Science, a non-profit medical research organization in Seattle, Washington, worked for several years to build a map of gene expression in the human brain. It released a Mouse Brain Atlas in 2007, then used similar techniques to complete its Human Brain Atlas in 2010. Last week, at its first hackathon, the Institute launched an API for the Human Brain Atlas, allowing researchers all over the world direct access to that information.