S. Krueger, I. Gorshkova, J. Brown, J. Hoskins, K. H. McKenney, and F. P. Schwarz. Determination of the conformations of camp receptor protein and its t127l,s128a mutant with and without camp from small angle neutron scattering measurements. J. Biol. Chem, 273:20001–20006, 1998.