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Amoeba
Amoebae (Amoeba proteus) are single-celled organisms familiar to many high school students. Despite their tiny size, they're giants in comparison to other types of cells. While sharing many similar characteristics to other animal cells, amoebae are primarily studied for their ability to move about. The molecular mechanisms that amoebae use to crawl are nearly identical to the molecular mechanisms that cells in all organisms use to move. Scientists have used this commonality to discover how our own cells move.