
right|thumb|460px|Electron micrographs showing alpha-carboxysomes from the chemoautotrophic bacterium Halothiobacillus|Halothiobacillus neapolitanus: (A) arranged within the cell, and (B) intact upon isolation. Scale bars indicate 100 nm.
right|thumb|460px|Electron micrographs showing alpha-carboxysomes from the chemoautotrophic bacterium Halothiobacillus|Halothiobacillus neapolitanus: (A) arranged within the cell, and (B) intact upon isolation. Scale bars indicate 100 nm.
Carboxysomes are bacterial microcompartments (BMCs) consisting of polyhedral protein shells filled with the enzymes ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO)—the predominant enzyme in carbon fixation and the rate limiting enzyme in the Calvin cycle—and carbonic anhydrase.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).