Nucleotide substitution: A?G.
The C15 enhancer has been mutated in the 'Z1', 'Z2' and 'Z3' zen binding clusters.
Nucleotide substitution: T?A.
Nucleotide substitution: A?C.
Nucleotide substitution: T?C.
Nucleotide substitution: T?G.
Nucleotide substitution: A?T.