Table 1. Mutations present in clonally purified m157 immune escape variants of MCMV.

Clone designation	Type of mutation	Genomic position*	Effect on m157
C1	104-bp deletion	216,397-216,500	Frame shift and premature stop
C2	8-bp deletion	216,762-216,769	Frame shift and premature stop
C4	8-bp insertion	216,495	Frame shift and premature stop
C5	104-bp deletion	216,397-216,500	Frame shift and premature stop
C6	9-bp deletion	216,033-216,041	Deletion of residues 282-TKR-284

^*Nucleotide positions are given relative to those in the prototypic Smith MCMV strain sequence (28).