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This is a Giant Microbes Serotonin plush toy. The plushie is blue with a red hat and features the chemical structure of serotonin embroidered on its body. It's in excellent, like-new condition, with the original tag still attached.

This unique stuffed toy is part of the Giant Microbes collection, known for their educational and fun representations of microbes, cells, and brain chemicals. It's perfect for science enthusiasts, students, or anyone who enjoys quirky and educational plush toys.