The polyhedral inclusions of Thiobacillus neapolitanus have been isolated; they contain ribulose diphosphate carboxylase.

The carboxysomes of Thiobacillus neapolitanus are shown, by electron microscopy, to consist of a paracrystalline array of 10-nm particles surrounded by a “membrane.” The 10-nm particles have a center hole or depression and have been previously identified as ribulose diphosphate carboxylase. The membrane is a monolayer approximately 3.5-nm thick.

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