The European Bioinformatics Institute (apart of the European Molecular Biology Lab) provides the data associated with real life science experiments since the database started as the first Nucleotide Sequence Data Library online.
Established in 1980 at the European Molecular Biology Laboratory in Heidelberg, Germany, to serve as a database for sequences rather than having scientists submit them into journals. In 1992, the EMBL council voted to establish & move the headquarters to the Wellcome Trust Genome Campus in Hinxton, UK where it would be in closer proximity with the major sequencing efforts at the Wellcome Trust Sanger Institute.
About the Expression Atlas Edit
Run by the EBI/EMBL, the expression atlas is an online database dedicated to providing information on gene expression patterns under different biological conditions such as a gene knock-out, a plant treated with a compound, or in a particular organism part or cell.
One of the two components of the Expression Atlas, the Baseline Atlas serves as the display for genetic information under "normal" conditions. This portion of the database could answer questions such as
"What genes are being expressed in the spleen?"
"What is the expression pattern for gene-X in normal tissue?"
Differential Atlas Edit
The second component of the Expression Atlas is called the "Differential Atlas". This allows users to see what genes are being up and down regulated throughout different environmental conditions, such as temperature conditions, yeast mutants.
Enhanced Searches Edit
The enhanced search options give you a number of preset sample attributes and experimental conditions that you can search along with for any specific gene expression.
The Expression Atlas homepage.