Table 4.

beta-galactosidase and MBL binding assay of IMR-90, NHBE and primary nasal epithelial cells at different ages.

A) IMR 90
PD cells	% beta gal cells (mean of 5 assays)	% MBL stained cells (mean of 5 assays)
39	0%	0%
46	34.6% (±12.1)	3.6% (±1.3)
	p<0.001	p<0.001
54	82.6% (±14.0)	10.3% (±4.8)

B) NHBE
PD cells	% beta gal cells (mean of 3 assays)	% MBL stained cells (mean of 5 assays)
7	0%	0%
10	0%	0%
15	0%	0%

C) Primary nasal epithelial cells
Days in culture	% beta gal cells (mean of 3 assays)	% MBL stained cells (mean of 5 assays)
7	0%	0%
14	0%	0%
25	0%	0%