The examination of fluid from a bulla (a blister) in search of Tzanck cells characteristic of varicella (chickenpox), herpes zoster, herpes simplex, and pemphigus vulgaris. Named for a Russian dermatologist Arnault Tzanck (1886-1954).
- Tumor, ear
Benign (noncancerous) bumps on the pinna of the ear (the external ear) or within the external ear canal. Most of these lumps and bumps are just harmless cysts and tumors. However, some of the bumps are bony overgrowths (known as exostoses or osteomas). If they are large and interfere with hearing, they can be surgically […]
- Tumor, carcinoid
surgery (to take out the cancer); radiation therapy (using high-dose x-rays to kill the cancer cells); biological therapy (using the body’s natural immune system to fight the cancer); and chemotherapy (using drugs to kill cancer cells). Carcinoid tumors are considered a type of endocrine tumor since they secrete a hormone (serotonin). They can occur as […]
- Tumor suppressor gene
A protective gene that normally limits the growth of tumors. When a tumor suppressor gene is mutated (altered), it may fail to keep a cancer from growing. BRCA1, an example of a tumor suppressor gene, was the first breast cancer gene to be identified; mutated forms of this gene are responsible for some cases of […]
A triplet consisting of uracil, adenine, 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.
A triplet consisting of uracil, adenine, guanine, 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.