Chains and heterogens:
PDB Chain Sequences:
>1f99A (A:) mktplteaiaaadsqgrflsntelqvvngrynratssleaakaltanadrlisgaanavy skfpyttqmpgpnysstaigkakcardigyylrmvtyclvvggtgpmddylvagleeinr tfelspswyiealkyiknnhglsgdvaneantyidyaintls
>1f99B (B:) mldafakvvaqadargeflsntqidallaivsegnkrldvvnkitnnasaivtnaaralf aeqpqlispggnaytsrrmaaclrdmeivlryvsyamiagdasvlddrclnglretyqal gtpgasvavaiqkmkdaalalvndttgtpagdcaslvaeiatyfdraaaava
>1f99K (K:) mktplteaiaaadsqgrflsntelqvvngrynratssleaakaltanadrlisgaanavy skfpyttqmpgpnysstaigkakcardigyylrmvtyclvvggtgpmddylvagleeinr tfelspswyiealkyiknnhglsgdvaneantyidyaintls
>1f99L (L:) mldafakvvaqadargeflsntqidallaivsegnkrldvvnkitnnasaivtnaaralf aeqpqlispggnaytsrrmaaclrdmeivlryvsyamiagdasvlddrclnglretyqal gtpgasvavaiqkmkdaalalvndttgtpagdcaslvaeiatyfdraaaava
>1f99M (M:) mktplteaiaaadsqgrflsntelqvvngrynratssleaakaltanadrlisgaanavy skfpyttqmpgpnysstaigkakcardigyylrmvtyclvvggtgpmddylvagleeinr tfelspswyiealkyiknnhglsgdvaneantyidyaintls
>1f99N (N:) mldafakvvaqadargeflsntqidallaivsegnkrldvvnkitnnasaivtnaaralf aeqpqlispggnaytsrrmaaclrdmeivlryvsyamiagdasvlddrclnglretyqal gtpgasvavaiqkmkdaalalvndttgtpagdcaslvaeiatyfdraaaava