TABLE 1.

Discrimination in binding of empty capsid and poliovirus to cells with poliovirus receptor (HeLa cells) and cells without poliovirus receptor (L cells)

Type of particle	109 particles bound		Relative binding discriminationa
	HeLa cells	L cells
Empty capsid	42.1	2.6	16.2
Poliovirus	40.9	2.9	14.1

^aRelative binding discrimination is the ratio of the number of particles binding to HeLa cells to the number of particles binding to L cells.