>4nxaA (A:) observed residues (from ATOM records)
vlsegewqlvlhvwakveadvaghgqdilirlfkshpetlekfdrfkhlkteaemkased
lkkhgvtvltalgailkkkghheaelkplaqshatkhkipikylefiseaiihvlhsrhp
gdfgadaqgamnkalelfrkdiaakykelgyqg