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- [43] STRUCTURAL ANALYSIS OF NUCLEOLAR PRECURSORS OF RIBOSOMAL RIBONUCLEIC ACIDS .1. ISOLATION AND CHARACTERIZATION OF LONGEST POLYPURINE SEQUENCES OF NUCLEOLAR 28 S RIBONUCLEIC ACID AND RIBOSOMAL 28 S RIBONUCLEIC ACID OF NOVIKOFF HEPATOMA ASCITES CELLS JOURNAL OF BIOLOGICAL CHEMISTRY, 1971, 246 (23) : 7144 - &