![](http://www.alamy.com/thumbs/6/C93EB305-F1ED-4286-8A2E-571885FE5FBB/2JKFT5H.jpg)
Polarized crystals (photographed under a microscope) of the drug 2-3 dideoxyadenosine, also known as ddA, a drug singly related to AZT or azidothymidine. The antiviral effect of ddA against HIV was discovered at the National Cancer Institute.
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Photo credit: © NIH / IMAGE POINT FR / BSIP / Alamy / Afripics
License: Licensed
Model Released: No
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