| 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 | the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe |
| hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | |
| the 20th letter of the Roman alphabet | |
| one of the four nucleotides used in building DNA, also known as 5'-thymidylate, thymidylate, or TMP; all four nucleotides have a common phosphate group and a sugar (ribose) | |
| a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine | |