. Author manuscript; available in PMC: 2008 Oct 31.

Published in final edited form as: J Comp Neurol. 2006 Oct 20;498(6):821–839. doi: 10.1002/cne.21082

Table 2.

Statistical analysis of M2R subcellular distribution in VTA dendrites distinguished by DAT labeling and size

ASSOCIATION VARIABLES	DENDRITIC GROUP	X²₁	p (Fisher)

Localization vs. Labeling	Small dendrites (<1μm)	126.675	<0.0001*
	Large dendrites (>1μm)	40.728	<0.0001*
Localization vs. Size	Single-labeled dendrites (M2R)	70.913	<0.0001*
	Dual-labeled dendrites (DAT+M2R)	0.974	0.4064
Labeling vs. Size	Cytoplasmic M2R localization	3.314	0.0829
	Plasmalemmal M2R localization	0.693	0.4304

Chi-square values and statistical signification (p, Fisher's exact value) for association among subcellular localization (cytoplasmic vs. plasmalemmal), type of labeling (single M2R vs. dual DAT+M2R) and dendritic size (small vs. large) of M2R-immunogold labeling observed in different groups of dendrites of the rat ventral tegmental area (VTA) with regard to those variables. A total number of 1800 M2R-immunogold particles were assessed within 746 randomly sampled VTA dendrites in 4 animals.