Table 7.

Parameters of human SP-A binding to human alveolar macrophages.

AM source	SP-A1			SP-A2
	Bmax	Kd (nM)	h	Bmax	Kd (nM)	h
Newborn AM	5.74 ± 0.75	9.55 ± 2.84	1.06 ± 0.17	10.23 ± 1.30	6.42 ± 0.70	0.91 ± 0.49
Adult AM	9.30 ± 0.34	7.02 ± 0.40	2.61 ± 0.34	31.12 ± 2.62	7.46 ± 1.10	1.73 ± 0.34
	SP-A1+EDTA			SP-A2+EDTA
Newborn AM	1.60 ± 0.24	4.43 ± 1.25	1.72 ± 0.90	2.74 ± 0.27	5.94 ± 1.42	1.02 ± 0.16
Adult AM	7.49 ± 2.22	15.23 ± 6.46	1.78 ± 0.65	14.36 ± 0.71	9.80 ± 0.73	1.97 ± 0.20