Extended Data Fig. 7: Micrographs of strains NP1 and NP2, virions, and vesicle like particles.

a, Image of a Ca. P. giovannonii NP1 host cell with an elongated morphology, evidence of budding, and possible virion attachment. Image acquired at 8,900x. Arrow mark budding and asterisks mark virions; not all budding and viruses have been marked. b–d, Representative images of vesicle-like particles found in strain NP1, independently acquired at 22,000x; asterisks mark virions. e, Image of strain NP2 host cell showing evidence of budding, acquired at 14,000x. Arrow marks budding. f–h, Representative images of vesicle-like particles found in strain NP2, independently acquired at 22,000x. Scale Bars: A, E = 500 nm; B-D, F-H = 100 nm. Panels A-D, images from 2 separate cultures of NP1. Panels E-H, images from 1 culture of NP2. Images for cultures were acquired from 2–3 distinct regions on 2–3 grids.