Immunogold labeling of C.
reinhardtii strain 18–7G or wild-type cells grown on acetate.
A, Strain 18–7G. B, Wild-type cells. Sections were probed with an
antibody raised against C. reinhardtii Rubisco, as
described in Methods. Bars indicate 0.5 μm. P,
Pyrenoid; and St, chloroplast stroma. No pyrenoids were seen in strain
18–7G, in agreement with previous observations (Rawat et al., 1996).