Your thymus gland is now a snuggly plush toy! The thymus provides infection-fighting cells -- called T-cells, after the thymus -- a nice place to live while they grow up and get ready to fight. Fun Fact: Thymuses are larger in kids than adults! The thymus retires after puberty. You'll learn this and more in our fact-filled 8-page hangtag. Tremendous 13" x 7" x 3.25" thymus gland will give you a much-needed immune system boost. Safe for all ages, this plush comes packed inside a biodegradable plastic sleeve. Designed in California, made in China.