Table I.

Distribution of distances between EGFR at the PM and IP ₃ R1 at Ca ²⁺ stores in rat adrenal medullary chromaffin cells^a

Distanceb	<15 nm	15–50 nm	>50 nm
Labeling percentage	38%	27%	35%

^aImages from four different tissue preparations labeled with gold particles for both EGFR and IP₃R1 were analyzed. The length of total PM measured was 49.04 μm.

^bIP₃R1 and EGFR were considered to be colocalized when the distance between the gold particles labeling both receptors was within the length of a single gold particle.