<span>Basically, it is fossilized coral that - for what we know - dates back to about 350 million years ago. The Petoskey Stone is known to develop in warm seas near the equator (since it is coral it forms in seas). This fits the location is close to the equator. Since this moved, it shows the power of Plate Tectonics. Plate Tectonics is related to the Theory of the Continental Drift.</span>
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AZT works by selectively inhibiting HIV's reverse transcriptase, the enzyme that the virus uses to make a DNA copy of its RNA. Reverse transcription is necessary for production of HIV's double-stranded DNA, which would be subsequently integrated into the genetic material of the infected cell to produce its proteins. All reverse transcriptase inhibitors are analogues of the naturally occurring deoxynucleotides needed to synthesize the viral DNA and they compete with the natural deoxynucleotides for incorporation into the growing viral DNA chain.