FIG. 6.
Reconstruction of viruses containing potential N gene reverting mutations of the MΔ2 lesion. Derivative plasmids were constructed from pLK61, containing the MΔ2 stop codon at codon 227 in addition to a single candidate compensating mutation in the N gene. Donor RNAs transcribed from these vectors were used to construct recombinants from fMHV, and the plaque sizes of the resulting double mutants were assessed at 68 h postinfection.