>4d3cA (A:) observed residues (from ATOM records) ntihefkksaktadqcanrctrnkglpftckafvfclwfpfnsmsdlyenkdyirnciig kggsykgtvsitksgikcqpwssmiphehsflpssyrgkdlqenycrnprgeeggpwcft snpevryevcdipqcse