| sequence variation in three mitochondrial dna genes among isolates of ascaridia galli originating from guangdong, hunan and yunnan provinces, china. | the present study examined sequence variation in three mitochondrial dna (mtdna) genes, namely cytochrome c oxidase subunit 3 (cox3) and nadh dehydrogenase subunits 1 and 4 (nad1 and nad4), among ascaridia galli isolates from different geographical localities in china. a portion of cox3 (pcox3), nad1 (pnad1) and nad4 (pnad4) genes were amplified by polymerase chain reaction (pcr) separately from adult a. galli individuals and the amplicons were subjected to sequencing from both directions. the l ... | 2013 | 23046568 |