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JG cells form at least two major circuits: the classic intraglomerular circuit consisting of external tufted (ET) and periglomerular (PG) cells and an interglomerular circuit comprised of the long-range connections of short axon (SA) cells. We examined the projections and the synaptic inputs of identified JG cell chemotypes using mice expressing green fluorescent protein (GFP) driven by the promoter for glutamic acid decarboxylase (GAD) 65 kDa, 67 kDa, or tyrosine hydroxylase (TH). Virtually all (97%) TH+ cells are also GAD67+ and are thus DAergic\u2013GABAergic neurons. Using a combination of retrograde tracing, whole-cell patch-clamp recording, and single-cell three-dimensional reconstruction, we show that different JG cell chemotypes contribute to distinct microcircuits within or between glomeruli. GAD65+ GABAergic PG cells ramify principally within one glomerulus and participate in uniglomerular circuits. DAergic\u2013GABAergic cells have extensive interglomerular projections. DAergic\u2013GABAergic SA cells comprise two subgroups. One subpopulation contacts 5\u201312 glomeruli and is referred to as \u201coligoglomerular.\u201d Approximately one-third of these oligoglomerular DAergic SA cells receive direct olfactory nerve (ON) synaptic input, and the remaining two-thirds receive input via a disynaptic ON\u2192ET\u2192SA circuit. The second population of DAergic\u2013GABAergic SA cells also disynaptic ON input and connect tens to hundreds of glomeruli in an extensive \u201cpolyglomerular\u201d network. 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