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Paleoproterozoic Primary Plastid Endosymbiosis, Basal Gloeomargarita Sisterhood, and the 1,648–0 Ma Archaeplastida vs. Paulinella Time-Tree Chronogram A 64-taxon, 1.76 Mb Dual-Pass Blinded Dayhoff-6 + CAT-GTR + Fossilized Birth-Death synthesis resolves the primary plastid stem divergence from basal freshwater Gloeomargarita lithophora D10 to 1,648.2 Ma, Crown Archaeplastida to 1,584.6 Ma, and the independent Paulinella chromatophora endosymbiosis to 114.2 Ma. Canonical Preprint URL: https://crvscience.com/labs/preprints/plastid-cyanobacteria-timetree-preprint Open-Source Software Repository (GNU GPL-3.0): https://github.com/bpwhite/crvscience-labs
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Bryan Pinckney White (2026) studied this question.
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