Figure 1.

The morphology and axonal connections of the major types of GABAergic interneuron are illustrated on the left, with extra information provided in table form on the right. This is a simplified version of all the possible phenotypic sub-types that have been described. Size of text indicates proportion of interneurons expressing a particular molecular marker. Multiple expression of markers is common. There is variation between species (see text). CALB1 and CALB2 are also known as calbindin and calretinin, 5HT3aR is a subtype of ionotropic serotonin receptor, NPY is neuropeptide Y, nNOS is neuronal nitric oxide synthase. Diagram adapted with permission from Zaitsev (2013) with additional information from Wang et al. (2004), Markram et al. (2004), Tricoire et al. (2010), Rudy et al. (2011), Taniguchi et al. (2013) and Zaitsev (2013).