>2x4zA (A:) observed residues (from ATOM records)
msheqfraalqlvvdpgdprsyldnfikigegstgivciatvrssgklvavkkmdlrkqq
rrellfnevvimrdyqhenvvemynsylvgdelwvvmefleggaltdivthtrmneeqia
avclavlqalsvlhaqgvihrdiksdsillthdgrvklsdfgfcaqvskevprrkslvgt
pywmapelisrlpygpevdiwslgimviemvdgeppyfnepplkamkmirdnlpprlknl
hkvspslkgfldrllvrdpaqrataaellkhpflakagppasivplmrqnrt