Table 1.

The effects of blocking NO synthesis in antennal lobe neurons

Neuron ID	Morphology	Physiology	Drug	Resting activity	Δg	Odor response	sGCir
PN1	MC-PN		7NI	Bursts	↓	↓ Bl, B, C	Yes
PN2	MC-PN		7NI	Bursts	↑	X: V	No
PN3	MC-PN		7NI	Bursts	↓		No
PN4	MGC-PN		7NIa	Bursts	↓	↓ Bl, C, B	No
PN5	AC-PN		7NIa	Bursts	↓		Yes
PN6	AC-PN		7NI	Bursts	↔	X: Bl, B, C	No
PN7		PN	7NI	Bursts	↓	X: H
PN8		PN	7NI	Bursts	↓	^ Bl
PN9		MGC-PN	7NI	Bursts	↓	X: Bl, C
PN10		AC-PN	LNAME	Bursts	↓
PN11	AC-PN		L-NAME	Increase	↓	^ H; ↓ Bl, M, L	Yes
PN12		PN	7NIa	Increase
PN13		PN	7NI	Increase
PN14	POa-PN		L-NAME	Decrease	↓	↓ Bl, V; ↔: H	Yes
PN15		PN	7NI	Decrease
LN16	Ia-LN		7NI	Bursts	↑		No
LN17	Ia-LN		7NI	Bursts	↔	↓ M; ↑ Bl, H;	No
LN18	Ib-LN		7NI	Increase	↔	X: Bl, C; ↑B	No
LN19	Ib-LN		7NI	Increase	↓	↓ Bl, H, L; ↑ M	Yes
LN20		LN	7NI	Increase	↓
LN21	Ib-LN		L-NAME	Decrease	↓	↓ Y	No
LN22	IIb-LN		L-NAME	Decrease	↔	↑ Bl, H, L, M	No
LN23	Ib-LN		7NI	No change	↔	↑ Bl, O	No
TOTALS	15	8	7NI:18; L-N:5	B: 12; I: 6; D: 4; N:1	20	X: 6; ↓: 7; ↑: 4; ^: 2	5/15 ir

Morphological types of neurons were determined by Lucifer yellow dye Wlling, and classiWed according to: (1) cell body location (MC medial cell body cluster; AC anterior cell body cluster; POa PNs in the lateral cell body cluster (LC) with projections leaving the AL via the outer cerebral tract, as deWned by Homberg et al. 1988); or (2) ramiWcations (PNs MGC macroglomerular complex; all the MGC neurons had cell bodies in the MC; LNs were categorized according to Matsumoto and Hildebrand (1981): (1) Ia-LNs have a major branch leading to arborizations only to a subset of the regular, plant-speciWc glomeruli; (2) Ib-LNs have equal arborizations to most regular glomeruli; (3) IIb-LNs have equal arborizations to most regular glomeruli and the MGC). Neurons were also characterized physiologically by electrically shocking the antennal nerve (Christensen et al. 1993). PN9 was categorized as MGC because of its response to pheromone. PN10 was categorized as an AC PN due to large spike amplitude and spontaneous burst-like behavior. Resting activity, change in conductance (Δg), and odor responses are characterized based on a >20% change from baseline, including decreases (↓), increases (↑), and no change from baseline (N, ↔ or < 20% change from baseline) when drug was applied. X indicates the response to odor was abolished during drug application. ^Indicates a loss of an inhibitory response to odor in which the odor stimulation normally caused a prolonged inhibition, but no increase in spike rate. Individual odors [B bombykal; C C15; Bl: pheromone blend (1:1 mixture of B and C); V cyclohexane (vehicle); H hibiscus oil; M methyl salicylate; L linalool; Y cyclohexanone; O control air (blank)] often caused multiple response types within the same neuron

^aIndicates that ODQ was also applied (see Table 2)