>5l18A (A:) observed residues (from ATOM records)
rnfnnltkglctinswhiygkdnavrigessdvlvtrepyvscdpdecrfyalsqgttir
gkhsngtihdrsqyraliswplsspptvynsrvecigwsstschdgksrmsicisgpnnn
asavvwynrrpvaeintwarnilrtqesecvchngvcpvvftdgsatgpadtriyyfkeg
kilkwesltgtakhieecscygertgitctcrdnwqgsnrpviqidpvamthtsqyicsp
vltdnprpndpnigkcndpypgnnnngvkgfsyldgantwlgrtistasrsgyemlkvpn
altddrskpiqgqtivlnadwsgysgsfmdywaegdcyracfyvelirgrpkedkvwwts
nsivsmcssteflgqwnwpdgakieyfl