>6ex4B (B:) observed residues (from ATOM records)
afklpnlpyaydalepyidqrtmefhhdkhhntyvtklnatvegtelehqsladmianld
kvpeamrmsvrnnggghfnhslfweilspnseekggviddikaqwgtldefknefankat
tlfgsgwtwlvvndgkleivttpnqdnpltegktpillfdvwehayylkyqnkrpdymta
fwnivnwkkvdelyqaak