>4x39A (A:) observed residues (from ATOM records)
afrytrsqsfdifdinqkcfvlesptqlvalhlqgpsssqkvrlnialyrpragtgqmpv
algikgyklymscvmsgteptlqleeadvmrdidsveltrfifyrldspaegttrfesaa
fpgwfictslqprqpvgitnqpdqvniatyklsgr