Table 4.

Immunohistochemical expression

mRNA expression	CHRNA3	CHRNA4	CHRNA5	CHRNA6	CHRNA7	CHRNB2	CHRNB3
α3	0.067	0.161	0.183	0.086	0.132	0.150	0.292
α4	0.254	0.579*	0.359*	0.141	0.401*	0.175	0.126
α5	0.063	0.373*	0.595*	0.079	0.433*	0.149	0.234
α6	0.139	0.500*	0.360*	0.090	0.252	0.197	0.293
α7	0.083	0.366*	0.194	0.082	0.552*	0.152	0.227
β2	0.067	0.139	0.138	0.029	0.031	0.531*	0.253
β3	0.093	0.128	0.051	0.003	0.118	0.277	0.076

Correlation matrix of nAChR mRNA expression levels with immunohistochemical intensity. The header row lists the mRNA expression of different nAChR subunits correlating with the corresponding nAChR subunit detection by immunohistochemistry in each column. Significant correlations are in bold

^*(P < 0.05).