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Homology between basonuclin-binding sites of human rRNA promoter and other genes. (A) BBS1. The dyad sequence, shown against a black background, with its axis of symmetry between positions −113 and −112. (B) The same sequence compared with homologous sequences of the three other selected DNA sequences (clones 1–3). Nucleotide identities are shown against a black background. In the case of clone 3, two sequences homologous to the sequence of rDNA were present.
