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Comparison of the predicted origins of replication in Lactobacillus delbrueckii plasmids. An iteron structure and a palindrome sequence (5′-TTTTTAAAAA-3′) are highly conserved in all L. delbrueckii plasmids. DR, direct repeat; IR, inverted repeat; PD, palindrome. A conserved palindrome sequence between all the plasmids is underlined. Stars indicate nonconserved nucleotides in the iteron repeat.
