Fig. 6: Structures of the finger proteins and fibers.

a Ribbon diagram of one copy of the finger protein, P19, with the rod-like cryo-EM density in its trench. b Superposition of the 25 copies of the P19 proteins within one fivefold asymmetric unit. c Structures of the three types of fibers (shown as ribbon diagrams) and their associated capsomers (shown as surfaces).