1. Thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer
   - liothyronine, T

1. Thyronine with three iodine atoms added

Derived forms: tri-iodothyronines, triiodothyronines

Type of: iodothyronine, thyroid hormone

Encyclopedia: Tri-iodothyronine

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