FIGURE 8.

MALDI-TOF mass spectra of chlorophyll isolated from ¹⁵N-grown PSI-less cells with (left) or without (right) SCPs that were supplemented with ¹⁴N-ALA for 0 (top) or 24 (bottom) h. Prior to the experiment, cells were grown in ¹⁵N medium, containing Na¹⁵NO₃, for 10 days, and the culture was diluted with ¹⁵N BG-11 to OD₇₃₀ = 0.35 at time 0. Unlabeled (¹⁴N) aminolevulinic acid was added at time 0 to a final concentration of 4 mm.