Figure 1

Figure 1. Characteristic top views of negatively stained particles isolated from Prochlorococcus MIT 9313. a–j, Particles isolated from cells grown in the presence (a, c, e, g) or absence (i) of iron viewed by electron microscopy and shown after overlaying the X-ray structures of the PSI trimer (green, b, j) (ref 11), PSII core dimer (green, d, f, h) and CP43 (red/orange)(ref 12). The Pcb proteins are coloured red or orange to identify them as products of the pcbA (PMT 1046) or pcbB (PMT 0496) genes respectively. Scale bar, 10 nm.

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