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Type I elements are multifunctional, cis-acting determinants that regulate the initiation of DNA replication, replication fork movement and transcription of the Tetrahymena thermophila rDNA minichromosome. Previous studies identified a protein, ssA-TIBF, that binds specifically to the A-rich strand of type I elements. Here, we examine interactions of ssA-TIBF with the wild-type C3 allele, and a natural...