This monoclonal antibody provides high‑specificity detection of thyroxine (T4), a major circulating thyroid hormone essential for metabolic and developmental regulation. Clone 100 offers strong affinity and minimal cross‑reactivity with T3 or other related molecules, supporting competitive immunoassays, ELISA, and hormone‑monitoring applications. MT4‑65A‑100 is ideal for thyroid research, endocrine diagnostics, and studies examining T4 regulation. Its reproducible performance ensures dependable detection across diverse sample types.