Phylogenetic tree based on 1,136 amino acid segment of the polyprotein the novel ball python nidovirus. A bootstrap-supported (1000 replicates) Maximum Likelihood tree was implemented in MEGA version 5.2. Unrooted tree is shown with bootstrap values at the nodes. Scale bars represent 0.5 amino acid substitutions per site. GenBank accession number: Bovine coronavirus: NC003045, Human coronavirus OC43:NC005147, Murine hepatitis virus strain A59:NC001846, Human coronavirus HKU1:NC006577, SARS coronavirus: NC004718, Middle East respiratory syndrome coronavirus: NC019843, Bat coronavirus HKU5-1:NC009020, Feline infectious peritonitis virus: NC002306, Canine coronavirus strain S378:KC175341, Transmissible gastroenteritis virus isolate TGEV-HX:KC962433, Porcine epidemic diarrhea virus: NC003436, Human coronavirus 229E:NC002645, Human coronavirus NL63:NC005831, Avian infectious bronchitis virus: NC001451, Fathead minnow nidovirus: GU002364, White bream virus: NC008516, Porcine torovirus strain SH1:JQ860350, Breda Virus:NC007447, Lactate dehydrogenase elevating virus: NC001639, Porcine respiratory and reproductive syndrome virus: NC001961, Simian hemorrhagic fever virus: NC003092, Equine arteritis virus: NC002532.