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Preparations of recombinant GroEL are of high purity. Preparations of intact recombinant GroEL of LVS (A) or Schu S4 (B) origin were subjected to mass spectroscopy. Peaks at 59.4 and 29.6 kDa represent the singly or doubly charged ionic forms of the GroEL proteins, respectively. A 15.8-kDa species is present in preparations of GroEL derived from the Schu S4 strain but not the LVS.
