= Endosymbiotic theory
<Endosymbiotic theory> explains the bacterial origins of <mitochondria> and <plastids> through enduring internal associations and subsequent integration. Survival inside a <biological cell> is only part of the problem: exchange through <membrane transport>, inherited division, <gene expression> and delivery of required <proteins> must work together. The elegance is evolutionary reuse of an existing cellular capability, followed by changes that make the partners operate as one system. <Origin and Evolution of Plastids and Photosynthesis in Eukaryotes by Geoffrey I. McFadden>[Abstract and “How to tame your symbiont”: metabolic, genetic and division integration]{ref}
The historical <On the origin of mitosing cells by Lynn Sagan> (1967, abstract and Introduction, pp. 225–226) synthesized a symbiotic account of <eukaryotic> origins and proposed tests using molecular evidence. Its Introduction explicitly acknowledged earlier proposals. It also hypothesized origins for other structures; the modern evidence for <mitochondria> and <plastids> should be assessed separately from the rest of that historical scheme.
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