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Watson-Crick model

n :  a model of DNA structure in which the molecule is a cross-linked double-stranded helix, each strand is composed of alternating links of phosphate and deoxyribose, and the strands are cross-linked by pairs of purine and pyrimidine bases projecting inward from the deoxyribose sugars and joined by hydrogen bonds with adenine paired with thymine and with cytosine paired with guanine - compare DOUBLE HELIX  .
 
 

 
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Monroe County Hospital (Forsyth, Georgia - Monroe County)