<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Meulemans, G</style></author><author><style face="normal" font="default" size="100%">Thierry van den Berg</style></author><author><style face="normal" font="default" size="100%">Decaesstecker, M</style></author><author><style face="normal" font="default" size="100%">Boschmans, M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Evolution of pigeon Newcastle disease virus strains.</style></title><secondary-title><style face="normal" font="default" size="100%">Avian Pathol</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Avian Pathol.</style></alt-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Amino Acid Sequence</style></keyword><keyword><style  face="normal" font="default" size="100%">Animals</style></keyword><keyword><style  face="normal" font="default" size="100%">Columbidae</style></keyword><keyword><style  face="normal" font="default" size="100%">Genes, Viral</style></keyword><keyword><style  face="normal" font="default" size="100%">Hemagglutination Tests</style></keyword><keyword><style  face="normal" font="default" size="100%">Newcastle disease virus</style></keyword><keyword><style  face="normal" font="default" size="100%">Poultry Diseases</style></keyword><keyword><style  face="normal" font="default" size="100%">Respirovirus Infections</style></keyword><keyword><style  face="normal" font="default" size="100%">virulence</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2002</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2002 Oct</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">31</style></volume><pages><style face="normal" font="default" size="100%">515-9</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Twenty-seven Newcastle disease virus isolates obtained during the years 1998 and 1999 from racing pigeons were shown to be antigenically indistinguishable from the pigeon paramyxovirus type 1 (PPMV-1) viruses isolated in the years 1983 and 1984. Partial sequencing of 240 base pairs of the F gene demonstrated at least 94.7% identity at the nucleotide level between isolates from 1983 and 1984, and more recent viruses isolated in 1998 and 1999. Most of the nucleotide changes observed were silent mutations as only six amino acid changes were observed. Three amino acid substitutions were observed in the F2/F1 cleavage site. The sequence of the F2/F1 cleavage site of all isolates was typical for pathogenic paramyxovirus 1 viruses. Amino acids at the F2/F1 cleavage site changed from (112)GRQKRF(117) to (112)RRQKRF(117), (112)RRKKRF(117) or (112)RRRKRF(117). The motif (112)RRQKRF(117) was present in the majority of the isolates but the intracerebral pathogenicity indexes of PPMV-1 isolates having this motif was highly variable but largely lower (mean, 0.69) than that reported for PPMV-1 viruses isolated in the years 1983 and 1984 (mean, 1.44).&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue><custom1><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/12427346?dopt=Abstract</style></custom1></record></records></xml>