Table 1.

Included ROIs.

Endocytosis				Exocytosis
Control (11 coverslips from 4 preparations)		Hypoxia (8 coverslips from 4 preparations)		Control (14 coverslips from 4 preparations)		Hypoxia (12 coverslips from 4 preparations)
Total: 352	Included: 258	Total: 110	Included: 101	Total: 679	Included: 526	Total: 580	Included: 452
73%		92%		77%		78%

ROIs were selected as explained in Methods. Several ROIs were discarded for analysis because they did not show a stable baseline fluorescence, because the onset of change did not coincide with the time of stimulation, or because the observed changes exceeded 2SD from the average response (n = 20, 9, 36, and 35 ROIs, respectively).