| intraspecific polymorphism of rdna among five nosema bombycis isolates from different geographic regions in china. | the microsporidian nosema bombycis is the causative agent of pébrine, a highly infectious disease of the silkworm bombyx mori. three regions of the multicopy rdna gene were examined in order to investigate the relationships among five nosema isolates from various regions of china. ribosomal dna alleles are present on each of the 18 chromosomes of n. bombycis and show a high degree of variation. in this study the small subunit (ssu) rdna, internal transcribed spacer (its) and intergenic spacer (i ... | 2013 | 23399511 |