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"All four Ivy cells {CA1 Ivy} were immunopositive for nNOS [neuronal nitric oxide synthase] in their somata (Figure 2C),
proximal dendrites, or axons (Figures 3C and 3D). Three tested
Ivy cells were immunopositive for NPY[neuropeptide Y] (soma), GABAAR-a1 [gamma aminobutyric acid alpha receptor- a1 subunit]
(somato-dendritic plasma membrane), and GAD [glutamate decarboxylase] (axon), confirming
their identity as GABA[gamma aminobutyric acid]ergic interneurons (Figure 2C,
Figure S2, and Table 1). None of the four cells expressed PV [parvalbumin]
or SM [somatostatin], differentiating them from bistratified cells {CA1 Bistratified} (Klausberger
et al., 2004; Pawelzik et al., 2002). Furthermore, the tested
cells were immunonegative for CCK [cholecystokinin], CB [calbindin], vasoactive
intestinal polypeptide (VIP), CR [calretinin], muscarinic
acetylcholine receptor 2, metabotropic
glutamate receptor 1a (mGlur1a), a-actinin-2
(one cell tested), m-opioid receptor, preprotachykinin
A or B, the Kv3.1b subunit of K+
channel, and metabotropic glutamate receptor 8a (mGlur8a)
in their input terminals (Table 1)."