The endostyle may be homologous with the thyroid gland of vertebrates, despite its differing function.
2.
A long ciliated groove, or endostyle, runs along one side of the pharynx, and a projecting ridge along the other.
3.
The authors also identify a dark strand on the lower interior surface of the anterior section, which they speculate is an endostyle.
4.
For instance, the closest living relatives of vertebrates, the tunicates and " Amphioxus ", have a structure very similar to that of larval lampreys ( the endostyle ), and this also secretes iodine-containing compounds ( albeit not thyroxine ).
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