TABLE 4.

FLOW CYTOMETRY ASSESSMENT OF CELL SURFACE EXPRESSION OF MERTK AND CD68 ON HUMAN ALVEOLAR MACROPHAGES OF NORMAL SMOKERS COMPARED WITH NORMAL NONSMOKERS^*

	Phenotype
	Normal Nonsmokers	Normal Smokers	P Value
Cells, %
CD68+	72 ± 4	83 ± 4	P > 0.05
MERTK+	21 ± 3	52 ± 4	P < 0.0001
CD68+ MERTK+	21 ± 4	60 ± 6	P < 0.0002

Definition of abbreviation: MERTK, c-mer protooncogene tyrosine kinase.

^*See Figure 4 for examples.