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Sequence alignments of beta-herpesvirus BPP homologs. The predicted amino acid sequence of the SCMV BPP was aligned with its homologs in HCMV (7, 23), CCMV (G. S. Hayward, personal communication), rat CMV (3), MCMV (34), HHV-6 (18), and HHV-7 (32) by using the ClustalW algorithm (40). Identical residues are in boldface; the two most highly group-conserved regions (CR1 and CR2) and a primate CMV-conserved cysteine tetrad (Cys tetrad) are boxed for reference.
