the mauriceville and varkud mitochondrial plasmids of neurospora are closely related , closed circular dnas ( 3.6 and 3.7 kb , respectively ; 1 kb = 10 ( 3 ) bases or base-pairs ) , whose characteristics suggest relationships to mitochondrial dna introns and retrotransposons .
C0012925
circular dnas
C0012929
mitochondrial dna