Abstract
DNAs from the genomes of Clostridium perfringens and Cytophaga johnsonii display orthodox A-DNA and B-DNA structures despite their high (A+L) nucleotide content. Unique structures, such as those found for synthetic DNAs having specific special sequences, do therefore not necessarily occur for DNAs having more random base sequence even if these have unusual base compositions. Clostridium perfringens DNA exhibits unusual structural properties only prior to purification by gel filtration.
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