/// <summary>
/// Calculate the effect on an exon
/// </summary>
/// <param name="exon"></param>
/// <returns></returns>
protected virtual bool ChangeCodon(Exon exon)
{
throw new InvalidOperationException("Unimplemented method codonChangeSingle() for\n\t\tVariant type : " + Variant.GetType().Name + "\n\t\tClass : " + GetType().Name + "\n\t\tVariant : " + Variant);
}