Table 1.

K_d values for hPIV binding to glycoprotein ligands determined from colorimetric binding assay^a

Virus	Ligand	Kd (μM cleavable sialic acidb)
hPIV1	hAGP	90.5 ± 10.6
	bFetuin	20.6 ± 2.8
hPIV2	hAGP	218.2 ± 10.9
	bFetuin	7.7 ± 1.8
hPIV3	hAGP	124.7 ± 30.2
	bFetuin	33.7 ± 6.7

^aK_d values were calculated from the experiments whose results are shown in Fig. 1.

^bCleavable sialic acid was used for comparison with K_m values.