The adrenal gland was a gland on many lifeforms and a part of the endocrine system that regulated the body's stress responses and produced adrenaline. According to Dr. Phlox, the scent of the Nausicaan adrenal gland gives off a fragrance not unlike the scent of a female Human's sweat after performing exercise. Yuuzhan Vong coral had one, from which Sinsor Khal extracted tissue for analysis and discovered that its genetic sequences translated to all of the organism's cells enabling it to spawn and communicate with other cells.

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