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Phosphate
A chemical compound containing the phosphate ion, PO4^3-, which plays a critical role in biological systems, including energy transfer and the structure of DNA and RNA.
Backbone
The series of vertebrae extending from the skull to the tail in vertebrate animals, providing support and protecting the spinal cord.
Topoisomerases
Enzymes that relieve twists and kinks in a DNA molecule by breaking and rejoining the strands.
DNA Molecules
The carriers of genetic information in living organisms, consisting of two long chains of nucleotides twisted into a double helix.
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