Alignment of complete 3c genes of FIPV from cats 1, 7, 9, 10, 11, 12 and 13. (A) Full-length 3c genes analyzed in this study were aligned with a type I FCoV, FCoV NTU2. The sequences were obtained from FIPV found in individual samples and tissues and are shown collectively. A box represents identified premature stop codons. (B) Scheme shows the location of premature stop codons (PT) of 3c gene of various specimens from different FIP cats.