Polit A, Bonarek P, Kepys B, Kedracka-Krok S, Górecki A, Wasylewski Z. Kinetic Studies of cAMP-induced Allosteric Changes in Mutants T127I, S128A, and T127I/S128A of the cAMP Receptor Protein from Escherichia coli. Journal of Biological Chemistry. 2003 Oct;278(44):43020–6. doi: 10.1074/jbc.m306398200.