Characterization of the FcBP-Encapsulin. (A) Surface and ribbon diagram representations of encapsulin (PDB: 3DKT). The position to introduce the FcBP is indicated with black dot. The FcBP is represented as v-shaped line. (B) Molecular mass measurements of dissociated subunits of encapsulin (bottom) and FcBP-encapsulin (top). Calculated and observed molecular masses were indicated. (C) Size exclusion profiles of encapsulin (bottom) and FcBP-encapsulin (top). (D) Transmission electron microscopic image of negatively stained FcBP-encapsulin with 2% uranyl acetate.