Before revision:  By contrast, a recently-discovered nanomaterial made from peptoids, structural isomers of peptides, displays a secondary-structure motif corresponding to  two regions on the Ramachandran plot [Mannige  et al. , Nature 526, 415 (2015)].
After revision:  By contrast, a recently-discovered nanomaterial made from peptoids, structural isomers of peptides, displays a secondary-structure motif corresponding to  two regions on the Ramachandran plot [Mannige  et al.  Nature 526, 415 (2015)].