Reengineering natural design by rational design and in vivo library selection: the HLH subdomain in bHLHZ proteins is a unique requirement for DNA-binding function

J Xu, A. T De Jong, G Chen, H. K Chow, C. O Damaso, A Schwartz Mittelman and J. A. Shin

Protein Engineering, Design and Selection 23 ( 5 ): 337 - 346 , 2010