TABLE 1.

RSV Mψ-Gag interaction, binding specificity, and packaging efficiency

Gag construct	β-gal activity (units) witha:		sMψ/αsMψ RNA ratio	Packaging efficiencyb
	sMψ RNA	αsMψ RNA
PR*	2,650 ± 540	126 ± 40	21	1
ΔCA	3,620 ± 900	362 ± 80	10	0.95 ± 0.05
NC-CHΔ1,2	480 ± 100	460 ± 80	1	0.16 ± 0.03
NC-SKL	860 ± 120	66 ± 40	13	0.04 ± 0.01
NC-RTL	2,120 ± 20	66 ± 10	32	0.7 ± 0.2

^aThe enzymatic activity represents the means of four to six assays from three or four independent transformants and the standard deviations. 

^bPackaging efficiencies are summarized from Fig. 4C and 5C. Packaging assays were performed four or five times, and their means and standard deviations are indicated.