Files in this Data Supplement:

• Supplemental file 1 - Fig. S1, TEM of chlorosomes of the epibiont; Fig. S2, TEM of the epibiont contact layer; Fig. S3, TEM of periplasmic tubules formed by the outer membrane of the central bacterium; Fig. S4 and S5, TEM of ultrathin sections of the central bacterium of “C. aggregatum” revealing paracrystalline structures and revealing the central bacterium membrane layer and membranous whirls.
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