A human cell has about 1000–2000 mtDNA molecules

A human egg has about 500,000 mtDNA molecules

A sperm has only about 100 mtDNA molecules

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A human cell has about 1000–2000 mtDNA molecules

A human egg has about 500,000 mtDNA molecules

A sperm has only about 100 mtDNA molecules

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Rab GTPases 

associate with transport vesicles and act as key regulators of vesicle trafficking to and fusion with the appropriate target membrane.

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Rab·GTP is enabled to bind to a variety of different proteins, known as Rab effectors.

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In yeast Rab protein is the Sec4 and its effectors are exocyst and Type V Myosin.

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In mammalian cells, Rab5 protein (early endosomes) and its effector protein known as EEA1 (early endosome antigen 1)

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Effector proteins of Rab6 is Kinesin

Effector proteins of Rab27 is Type V Myosin

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