* Answers true if more than 85% of the sequence residues (ignoring gaps) are
* A, G, C, T or U, else false. This is just a heuristic guess and may give a
* wrong answer (as AGCT are also amino acid codes).
* Answers true if more than 85% of the sequence residues (ignoring gaps) are
* A, G, C, T or U, else false. This is just a heuristic guess and may give a
* wrong answer (as AGCT are also amino acid codes).