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Hypothetical evolutionary reduction of secondary plastids to give the appearance of primary plastids. Organisms representative of the condition are given below each diagram. Conditions 1 (65) through 4 are widely accepted (3, 4, 8, 9, 54, 55, 63, 64) to explain membrane variability in the plastids of photosynthetic eukaryotes. N1, primary host cell nucleus; N2, secondary host cell nucleus; Nm, nucleomorph (vestigial endosymbiont nucleus); P, plastid.
