Table 1.

Analysis of RB membrane properties from wild-type and touchdown mutant larvae

	Electrical stimulation of cell body			Electrical stimulation of peripheral neurite			Mechanical stimulation of peripheral neurite
	wt	tdo	p	wt	tdo	p	wt	tdo	p
Resting membrane potential (mV)	−67.4 ± 1.6	−66.3 ± 1.6	0.6	—	—	—	—	—	—
Action potential threshold (mV)	−28.6 ± 1.5	−29.6 ± 0.6	0.6	−64.4 ± 2.6	−63.4 ± 2.5	0.8	—	—	—
Action potential threshold (μm of displacement)	—	—	—	—	—	—	24.5 ± 1.7	22.2 ± 3.7	0.6
Amplitude of overshoot (mV)	18.2 ± 6.7	13.3 ± 6.9	0.6	24.4 ± 9.6	11.9 ± 10.3	0.4	9.0 ± 6.0	4.5 ± 10.9	0.7
Amplitude of undershoot (mV)	−76.3 ± 1.3	−69.6 ± 1.5	0.005	−80.0 ± 1.6	−72.2 ± 1.0	0.002	−72.0 ± 2.9	−69.9 ± 1.4	0.6

Each RB was tested with all three types of stimulation so the resting membrane potential data are only shown in the Electrical stimulation of cell body column. Data from Type I and Type II neurons were pooled because no significant difference was observed between them for any of these parameters. n = 10 for each from several clutches.