TABLE 3.

Semiquantitative immunoanalysis of CR3 expression on the surface of primary cervical cells^a

Sample	Absorbance at 490 nm
	Ectocervical cells	Endocervical cells
Uninfected control	0.53 ± 0.13	0.30 ± 0.03
Strain 1291	2.37 ± 0.18	1.65 ± 0.17
Strain 1291ΔPLD	0.68 ± 0.12	0.34 ± 0.11
Uninfected control + primed wt sup	1.08 ± 0.36	0.73 ± 0.06
Uninfected control + primed pld sup	0.44 ± 0.14	0.38 ± 0.05
1291ΔPLD + primed wt sup	1.36 ± 0.43	1.13 ± 0.28
1291ΔPLD + primed pld sup	0.39 ± 0.13	0.31 ± 0.08
No primary antibody	0.06 ± 0.01	0.08 ± 0.01

^aValues given are the mean values in which the presence of CR3 on the cervical cell surface was measured by an immunoassay with monoclonal antibody H5A4 as outlined in the text. See Table 2, footnote a, for abbreviations.