>2xffA (A:) observed residues (from ATOM records)
nvkgnyvqvyvmlpldavsvnnrfekgdelraqlrklveagvdgvmvdvwwglvegkgpk
aydwsaykqlfelvqkaglklqaimsfhqcggnvgdavnipipqwvrdvgtrdpdifytd
ghgtrnieyltlgvdnqplfhgrsavqmyadymtsfrenmkefldagvivdievglgpag
emrypsypqshgwsfpgigeficydkylqadfkaaaaavghpewefpndvgqyndtpert
qffrdngtylsekgrfflawysnnlikhgdrildeankvflgykvqlaikisgihwwykv
pshaaeltagyynlhdrdgyrtiarmlkrhrasinftcaemrdseqssqamsapeelvqq
vlsagwreglnvacenalprydptayntilrnarphginqsgppehklfgftylrlsnql
vegqnyanfktfvdrmhanlprdpyvdpmaplprsgpeisiemilqaaqpklqpfpfqeh
tdlpvg