Chains and heterogens:
PDB Chain Sequences:
>1mrrA (A:) ayttfsatkndqlkepmffgqpvqvarydqqkydifekliekqlsffwrpeevdvsrdri dyqalpehekhifisnlkyqtlldsiqgrspnvallplisipeletwvetwafsetihsr sythiirnivndpsvvfddivtneqiqkraegissyydeliemtsywhllgegthtvngk tvtvslrelkkklylclmsvnaleairfyvsfacsfafaerelmegnakiirliardeal hltgtqhmlnllrsgaddpemaeiaeeckqecydlfvqaaqqekdwadylfrdgsmigln kdilcqyveyitnirmqavgldlpfntrsnpipwintwlv
>1mrrB (B:) ayttfsatkndqlkepmffgqpvqvarydqqkydifekliekqlsffwrpeevdvsrdri dyqalpehekhifisnlkyqtlldsiqgrspnvallplisipeletwvetwafsetihsr sythiirnivndpsvvfddivtneqiqkraegissyydeliemtsywhllgegthtvngk tvtvslrelkkklylclmsvnaleairfyvsfacsfafaerelmegnakiirliardeal hltgtqhmlnllrsgaddpemaeiaeeckqecydlfvqaaqqekdwadylfrdgsmigln kdilcqyveyitnirmqavgldlpfntrsnpipwintwlv