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(A) Mass spectrometry data indicating two phosphorylated residues, threonine 109 and serine 161, of the MgrA amino acid sequence, are shown in boldface and underlined. (B) SDS-PAGE analysis of histidine-tagged MgrA purified with a Ni affinity column after incubation with crude extracts prepared from RN6390 and RN6390(pQT16), which overexpressed pknB.
