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Stage-specific embryonic antigen 3 (SSEA-3) is a glycosphingolipid, specifically, an oligosaccharide composed of five carbohydrate units connected to a sphingolipid, also known as globoside-5 (Gb5). Sphingolipids were originally discovered in 1884 by Johann Ludwig Wilhelm Thudichum who named them after the Sphinx of Greek mythology in reference to the unresolved riddle of their function.[1] It is now known that sphingolipids function as key players in cell signaling [2] and the SSEA-3 molecule as a whole plays a key role in identifying many types of mammalian cells with pluripotent and stem cell-like characteristics.[3][4]
