IT has very commonly been supposed that the endostyle of the Protochordata is homologous with that of the ammocoete larva and is thus the forerunner of the thyroid gland, which is well known to ...

The thyroid, a vital endocrine organ in vertebrates, plays a key role in regulating metabolism and supporting growth. The first gland of both the nervous system and endocrine system to mature during ...

Researchers engaged in acts of discovery sometimes have to confront the truly strange and make sense of it. Many of the fossils from the Cambrian Period (about 543–510 million years ago) are cases in ...