Figure 3. Electron micrographs and image analysis
of a total of 2,590 particle data set contained in fraction
4 (F4) of the sucrose density gradient. (a) Negatively stained
particles are identified as large Pcb–PSII supercomplexes
(boxed) and PSI trimers (circled). (b) Top view of Pcb–PSII
supercomplex obtained by image processing of 713 particles of
the type boxed in a. (c) Pcb–PSII supercomplex with outlines
of the core dimer and CP43 (for each Pcb subunit) derived from
x-ray analysis of PSII isolated from the cyanobacterium S.
elongatus (27). (Bar, 100 Å.)
