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UDA is monomorphic in wild nurse shark individuals. A) Alignment of nucleotide sequences obtained from cloning of PCR products of α1 and α2 UAA and UDA from four wild nurse shark individuals (1, 2, 3 and 4). B) Trace files of nucleotide sequences obtained by direct sequencing of PCR products of α1 UAA (one individual) and of α1 and α2 UDA for the same four wild nurse shark individuals (1, 2, 3 and 4). Dots indicate nucleotides identical to nurse shark #1 (highlight).
