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In vivo localization of new symbiont 20S proteasomal components in the PPC of the diatom P. tricornutum. eGFP fusion proteins Ptsβ1 and Ptsα3-1 show fluorescence in the middle of the two plastid lobes, indicating a PPC localization in contrast to the host proteins Pthβ7 and PthRpn10, which localize in areas around the plastid (scale, 10 μm; TL, transmission light; PAF, plastid autofluorescence).
