Structures of deletion derivatives of WBLH1 and WBLH2 and their interactions with wheat KNOX proteins. The SKY, BEL and homeobox domains are shown by yellow, green and red boxes, respectively. Numbers indicate amino acid residue numbers at the deletion break points. Interaction activity with WKNOX1 and WLG4 and transcriptional activity are also summarized on the right side. Circles indicate interacting or activating, and crosses indicate noninteracting or nonactivating.