Protegen ID	Gene Name	Sequence Strain (Species/Organism)	NCBI Gene ID	NCBI Nucleotide GI	NCBI Protein GI	Locus Tag	Genbank Accession	Protein Accession	Protein Name	Protein Annotation	Molecule Role	Molecule Role Annotation	COG	PMID
5071	ORF3-1			847843	847844				ORF 3 gene		Virulence factor	MUTATION: The gene 3 is intact in the two virulent PRCV isolates, whereas gene 3 is altered in the two low virulence isolates. A similar observation has been reported for TGEV as a nonpathogenic TGEV mutant with a small plaque morphology had a deletion in gene 3. We have also observed that one of the low virulence PRCV isolates, IA 1894, which has a deletion in gene 3, replicates poorly in cell cultures. Collectively these studies suggest that gene 3 may be an important determinant for in vivo virulence and in vitro replication of coronaviruses [Ref7473:Paul et al., 1997].		9192036