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Engineering C\n                    <jats:sub>3<\/jats:sub>\n                    crops with algal pyrenoids could increase yields, but progress is hampered by the deep evolutionary divide between crops and algae. Here, we show that hornworts, the only land plants with pyrenoids, have an unusual Rubisco small subunit, RbcS-STAR, the C-terminal coiled-coil domain of which oligomerizes to mediate Rubisco condensation. RbcS-STAR is incorporated into the Rubisco holoenzyme and thus acts as an \u201cinnate\u201d Rubisco linker. Expression of RbcS-STAR in pyrenoid-lacking species, including\n                    <jats:italic toggle=\"yes\">Arabidopsis<\/jats:italic>\n                    , is sufficient to induce pyrenoid-like condensates. 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