thyroid gland

mentioned: calcitonin, thyroxin, triiodothyronine
https://doi.org/10.1351/goldbook.11305

Bilobar endocrine gland, located below the prominence of cartilage surrounding the larynx (the Adam’s apple), that produces and secretes the hormones triiodothyronine (T3), thyroxin (T4), and calcitonin.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 813 [Terms] [Paper]