Table 3. Lowest and mean amino acid identities for the N protein of porcine, human, canine and feline alphacoronaviruses.

Mean and lowest amino acid identities were defined for at least ten different strains of the same species from the same host. The N protein sequence was chosen as a conserved protein and because its sequence is available for the majority of strains in the genus Alphacoronavirus. The lowest and mean amino acid identities for the N protein of FIPV and CCoV are highlighted in bold. PRCV, Porcine respiratory coronavirus; see text and figures for other abbreviations.

Species	Amino acid identity (%)
	Lowest	Mean
TGEV/PRCV	96.3	98.2
PEDV	95.7	97.5
HCoV NL63	99.4	99.7
HCoV 229E	96.4	98.7
FIPV	89.6	92.0
CCoV	91.3	96.3