Boyce Thompson Institute and Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, USA

Jingfang Yu, Bennett W. Fox, Chester J. J. Wrobel, Diana Fajardo Palomino, Brian J. Curtis, Bingsen Zhang, Henry H. Le, Arnaud Tauffenberger & Frank C. Schroeder

Department of Biological Sciences, Columbia University, Howard Hughes Medical Institute, New York, NY, USA

Merly C. Vogt & Oliver Hobert

Correspondence to Oliver Hobert or Frank C. Schroeder.