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  2. Photosystem I - Wikipedia

    en.wikipedia.org/wiki/Photosystem_I

    Location of the psa genes in the chloroplast genome of Arabidopsis thaliana.The 21 protein-coding genes involved in photosynthesis are displayed as green boxes. Photosystem I (PSI, or plastocyanin–ferredoxin oxidoreductase) is one of two photosystems in the photosynthetic light reactions of algae, plants, and cyanobacteria.

  3. List of search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_search_engines

    License SA 3.0 and the GNU Free Documentation License 1.2 Recoll: Linux, Unix, Windows, macOS: Open-source desktop search tool for Unix/Linux GPL [8] Spotlight: macOS: Found in Apple Mac OS X "Tiger" and later OS X releases. Proprietary Strigi: Linux, Unix, Solaris, Mac OS X and Windows: Cross-platform open-source desktop search engine.