Zebra
‘When you hear hoof beats, think of horses, not zebras.’ For example, when someone develops a mild transient cough, a virus infection is the most logical and likely cause, and tuberculosis is a zebra.
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Zeta-chain-associated protein kinase 70. A member of the protein tyrosine kinase family, ZAP-70 is normally expressed in T cells and natural killer cells and has a critical role in the initiation of T-cell signaling. ZAP-70 is expressed in T cells and tumors of T-cell lineage. A high level of ZAP-70 expression appears restricted to T-cell […]
- Z chromosome
A sex chromosome in certain animals, such as chickens, turkeys, and moths. In humans, males are XY and females XX, but in animals with a Z chromosome, males are ZZ and females are WZ.
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Benign growths that originate in the mucous membranes lining the nasal passages or paranasal sinuses. Polyps are believed to arise in the nasal mucosa as a result of chronic inflammation. Up to 4% of adults have nasal polyps; they can also occur in children, particularly those with chronic respiratory conditions such as cystic fibrosis. Symptoms […]
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Removal of all breast tissue, from just under the collarbone to the abdomen, including the chest wall muscles and the axillary lymph nodes in the armpit. In a trial begun in 1971, the efficacy of radical mastectomy was compared with that of total mastectomy. This historic trial spelled the end of radical mastectomy and started […]