Nucleotide substitution: G-124T.
PCNA promoter sequences from -168 to +137 drive expression of lacZ. Nucleotides within the Rfx2 protein binding site (nucleotides -124 to -120 inclusive) have been mutated.
Nucleotide substitution: T-123G.
Nucleotide substitution: T-122G.
Nucleotide substitution: G-121T.
Nucleotide substitution: G-120T.