2JBA:
reference: The X-ray crystal structures of two constitutively active mutants of the Escherichia coli PhoB receiver domain give insights into activation., Arribas-Bosacoma R, Kim SK, Ferrer-Orta C, Blanco AG, Pereira PJ, Gomis-Ruth FX, Wanner BL, Coll M, Sola M, J Mol Biol. 2007 Feb 16;366(2):626-41. Epub 2006 Nov 14. PMID: 17182055

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