Chain-termination codon: A set of three adjacent bases in the DNA or their complementary bases in messenger RNA that specifies the end of a polypeptide chain.
The three chain-termination codons (in messenger RNA) are UAA, UAG, and UGA. They are also called termination codons, stop codons, or nonsense codons.
U = uracil; A = adenine; G = guanine.
A cyst of the little glands in the eyelids that make a lubricant which they discharge through tiny openings in the edges of the lids. The lubricant is a fatty substance called sebum characteristic of sebaceous glands. These glands are called the meibomian glands. Inflammation of them is termed meibomianitis or, alternatively, meibomitis. Chronic inflammation […]
- Chamber, anterior
Chamber, anterior: The space in the eye that is behind the cornea and in front of the iris. The cornea is the outer, transparent, dome-like structure that covers the iris, pupil, and the anterior chamber. The iris is the colored ring of tissue suspended behind the cornea and immediately in front of the lens; it […]
- Chamber, posterior
Chamber, posterior: The space in the eye behind the iris and in front of the lens. The iris is the colored ring of tissue that regulates the amount of light entering the eye by adjusting the size of the pupil. The lens is the transparent biconvex body in the eye that refracts light. (By “biconvex” […]
Chamomile: An herb often used in the form of a tea as a sedative. Allergic reactions to chamomile can occur, particularly in persons allergic to ragweed. Reported reactions include abdominal cramps, tongue thickness, tightness in the throat, swelling of the lips, throat and eyes, itching all over the body, hives, and blockage of the breathing […]
CHAMPUS: Civilian Health and Medical Program of the Uniformed Services. CHAMPUS is a US federally funded health program that provides beneficiaries with medical care, supplemental to that available in US military and Public Health Service facilities. All CHAMPUS beneficiaries switch to using Medicare at age 65. CHAMPUS is like Medicare in that the government contracts […]