Table 1. Cross correlation coefficients.

	cell number N	covered area A	circularity <C>	TIRF intensity	isolated cells N s
ρ|Z (t)|,y(t)	0.176±0.048	0.138±0.048	0.035±0.02	0.41±0.03	–0.7±0.15

Cross-correlation coefficient ρ of the corresponding descriptors, cell number N, mean covered area per cell A, mean circularity <C>, TIRF intensity (time axis multiplied with 1.94 to match periodicity of impedance spikes), and number of isolated cells N _s with impedance time traces. Amebas were displaying oscillations in impedance recorded at 4 kHz generator frequency.