Cross references: GABA GABA Gate GABA Metabotropic Receptor Transmembrane Transport in General Ion Channels Ligand-gated Ion Channel GABA Uptake by a Bacterial System... (PubMed) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC298065/?tool=pubmed Full length HTML and PDF both available. "The role of GABA in organisms lacking nervous tissue is not known. This report describes, in a strain of Pseudomonas fluorescens, a GABA uptake system with binding characteristics like those of the GABA (type A) brain receptor." Early Evolution of Ionotropic GABA Receptors and Selective Regimes Acting on the Mammalian-Specific Theta and Epsilon Subunits Searching Google for "gaba receptor evolution" yielded 250,000 references.
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