Thyroid hormone (TH). triiodothyronine (T3). and thyroxine (T4). which are released from the thyroid. https://www.roneverhart.com/Western-Digital-Ultrastar-DC-HC550-WUH721816ALE6L0-0F38460-16TB-7-2K-RPM-SATA-6Gb-s-512e-ISE-3-5in-Hard-Drive/