Ubiquitous
Present everywhere. The small protein called ubiquitin was so-named because it is present in all types of cells and its amino acid sequence is identical in all creatures from insects to humans.
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- UDP-glucuronosyltransferase
A liver enzyme essential to the disposal of bilirubin (the chemical that results from the normal breakdown of hemoglobin from red blood cells). An abnormality of this enzyme (UDP-glucuronosyltransferase) results in a condition called Gilbert’s disease in which there are mild elevations of bilirubin pigment in the blood. The elevated bilirubin pigment can sometimes cause […]
- UGA
A triplet consisting of uracil,guanine, adenine, in that order, that acts as a stop codon in messenger RNA (mRNA), signaling the termination of translation of an mRNA molecule and the release of the nascent polypeptide chain.
- UL
1. Upper lid (of the eye). 2. Upper limit. No evidence was found for chronic excess intakes of potassium in apparently health individuals and therefore no UL was established for potassium.
- Ulcer
A lesion that is eroding away the skin or mucous membrane. Ulcers can have various causes, depending on their location. Ulcers on the skin are usually due to irritation, as in the case of bedsores, and may become inflamed and/or infected as they grow. Ulcers in the gastrointestinal tract were once attributed to stress, but […]
- Ulcer, aphthous
A small sensitive painful ulcer crater in the lining of the mouth. Commonly called a canker sore. Picture of a canker sore Aphthous ulcers are one of the most common problems that occur in the mouth. About 20% of the population (1 in 5 people) have aphthous ulcers at any given time. Aphthous ulcers typically […]