Fig. 4.

Cryo-EM of structures produced by expression of co-expression clones O(141–284) + N (A), O(195–284) + N (B) and O(244–284) + N (C); fusion protein clones O(141–284)::N (D), O(195– 284)::N (E) and O(244–284)::N (F); and fusion/co-expression clones O(141–284)::N + N (G) and O(195–284)::N + N (H) and O(244–284)::N + N (I). Examples of well-formed particles of P2 and P4 size are indicated in each panel (where available) by black (P2) and white (P4) arrows. Some of the many thin-walled shells produced in (D) are indicated with asterisks. Scale bar, 100 nm