Table 2. Responses to pyrethrum of 16 odorant receptors in the Drosophila ab3A empty neuron.

dilution	ab1		ab2		ab4	ab5			ab6	ab7		ab8		ab10
	42b	10a	59b	85a	7a	82a	33b	47a	49b	98a	67c	43b	9a	67a	85f
10−2	++	●	●	●	+	●	●	●	●	●	●	●	●	●	●
10−1	+++	●	+	●	++	●	●	●	●	+	●	●	●	●	●

Note: “●,” n < 20 spikes/s; “+,” 20 ≤ n < 40 spikes/s; “++,” 40 ≤ n < 60 spikes/s; “+++,” n ≥ 60 spikes/s. Each compound was delivered in 30 μL of the 10⁻² dilution (v v^-1). n = 6 flies/sensilla. The original sensilla (ab1 –ab10) in which 16 Ors are expressed are indicated above Ors.