 have complementary
      residues).  You also can also define "ambiguous" symbols that represent
      more than one symbol in your custom alphabet (e.g., "R" to represent purines
      in a DNA-based alphabet.) You then provide your
      custom alphabet definition as a text file to the MEME Suite programs
      to inform them that sequences you provide use this non-standard alphabet.
      </p>
    </div>

    <h3>Quick Overview</h3>
    <p>You can look at some examples of alphabet definitions to
    get