Chains and heterogens:
PDB Chain Sequences:
>1k89A (A:) skyvdrviaevekkyadepefvqtveevlsslgpvvdahpeyeevallermvipervief rvpweddngkvhvntgyrvqfngaigpylgglrfapsvnlsimkflgfeqafkdslttlp mggakggsdfdpngksdrevmrfcqafmtelyrhigpdidvpagdlgvgarelgymygqy rkivggfyngvltgkarsfggslvrpeatgygsvyyveavmkhendtlvgktvalagfgn vawgaakklaelgakavtlsgpdgyiydpegitteekinymlemrasgrnkvqdyadkfg vqffpgekpwgqkvdiimpcatqndvdleqakkivannvkyyievanmpttnealrflmq qpnmvvapskavnaggvlvsgfemsqnserlswtaeevdsklhqvmtdihdgsaaaaery glgynlvaganivgfqkiadammaqgiaw