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The next sets of slides are about how Meischer discovered DNA as nuclein from pus cells and how Levene differentiated DNA from RNA.
deoxyribonucleic acid (DNA)--A nuclein of complex molecular structure that is the major component of genes; it plays an important role in the gene action of chromosomes.
Working from masses of white blood cells soaked from pus-clotted bandages, he extracted large amounts of a chemical that he called nuclein because it could be derived from cell nuclei.

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