Twinkle

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A 684-residue mitochondrial protein involved in mitochondrial DNA (mtDNA) metabolism, which may function as an adenine nucleotide-dependent DNA helicase and be a key regulator of mtDNA copy number in mammals. Twinkle is thought to be critical for lifetime maintenance of mtDNA integrity
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References in classic literature ?
Weeks spoke seriously, but his gray eyes twinkled a little at the end of his long speech, and Philip flushed when he saw that the American was making fun of him.
Because it flashed and twinkled more than all other jewels because it was clockwork.