We are biological machines
The DNA replication complex, an assembly of proteins that synthesizes new DNA before cell division.  It consists of helicase, primase, single-strand binding proteins, and dna polymerase III. Because DNA strands can only be copied in one direction, the complex must pull out loops of one strand and replicate it in fragments. At this moment there are hundreds of trillions of these molecular machines in constant activity within your body.

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DNA replication complex
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