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Surveys of animal mitochondrial DNA (mtDNA) polymorphism reveal that mtDNA length variation is common. Much of this variation involves non-coding tandem repeat arrays in the main control region of the molecule. Despite a high mutation rate, generating systematic individual mtDNA length heteroplasmy, the number of repeats in a tandem array is maintained within a narrow range in lagomorphs. To investigate...
In Xenopus laevis the single-stranded DNA binding protein imported into the mitochondria consists of two highly related polypeptides. The establishment of the genomic nucleotide sequences reveals that they are encoded by two different genes, XLSSB1 and XLSSB2. The deduced amino acid sequence is identical to the direct amino acid sequence determined by Edman degradation of the mitochondrial polypeptides...
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