>4r2vB (B:) observed residues (from ATOM records)
mmiittmqdaigrtpvfkftnkdypiplnsaiyaklehlnpggsvkdrlgqylieegfkt
gkitskttiieptagntgialalvaikhhlktifvvpekfstekqqimralgalvintpt
segisgaikkskelaesipdsylplqfenpdnpaayyhtlapeivqelgtnltsfvagig
sggtfagtarylkeripairligvepegsilnggepgpheiegigvefippffenldidg
fetisdeegfsytrklakkngllvgsssgaafvaalkeaqrlpegsqvltifpdvadryl
skgiyl