Fig. 2.
From: Blob-ology and biology of cryo-EM: an interview with Helen Saibil
Structures of chaperonin complexes with folding intermediates of a bacteriophage capsid protein. Sections through reconstructions of the complexes were sorted into three classes. One class did not show substrate density, and two others had non-native protein (red) bound in the open ring. One of these bound classes also had density inside the enclosed folding chamber, with the shape of the folded large domain of the gp23 substrate protein (green). Image adapted from [5]