TABLE 1.

Lengths and packaging efficiencies^a of viral sequences from the 5′ region of RSV

Clone	Length (nt)	Packaging efficiency
Aψ	270	+++
AψΔ3′	190	+++
Δ5′Aψ	240	+++
Mψ	160	+++
Δ5′Mψ	144	+
MψΔ3′	105	++

^aPackaging efficiency was calculated as the ratio of the relative amount of neo-specific RNA packaged in particles, as measured by RNase protection analysis, to the relative number of particles, as measured by Western analysis. Packaging efficiencies were normalized to that of Mψ. For more detail see the text. Each plus sign represents approximately 1 order of magnitude.