This image is one of my favorite scientific visualizations and it makes for a great large scale print.  This image only exists in computational space and represents a glancing section of real retina from a mus musculus probed with antibodies to three small molecular labels from Signature Immunologics.  Anti-taurine, anti-glutamine and anti-glutamate assigned to red, green and blue color channels respectively.  This image shows two fundamentally important things about metabolomics: 1) Diversity of metabolomic signatures across cell classes is extensive and in this case, it shows how complex the retina is.  2) Within cell classes, metabolomic envelopes are very narrowly constrained in healthy tissue.  Pathology is another issue for another time…