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Amino-acid sequence alignment of M proteins from SARS coronavirus (SCV) and human coronavirus HKU1 (HKU1). Alignment was generated by Clustal ω (EMBL-EBI server (http://www.ebi.ac.uk/Tools/msa/clustalw2/). The identity between the two proteins is 34.8%. Identical residues are indicated by asterisks (*). Strongly and weakly similar residues are highlighted by colons (:) and dots (.), respectively. SARS, severe acute respiratory syndrome.
