Figure 9 : TSH is assembled from an alpha subunit and a beta subunit.

A particular segment of the beta subunit, known as the buckle or seatbelt, wraps around the alpha subunit to form the active hormone. This seatbelt region also helps stabilize the hormone’s structure.

Seneff et al.Journal of Autism  2016 3:1DOI : 10.7243/2054-992X-3-1