a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine

nucleotide derived from thymine with a deoxyribose sugar and a phosphate group

the 20th letter of the Roman alphabet

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

hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells