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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- ZAP-70
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.
- Klippel-Feil sequence
Short neck, low hairline at the nape of the neck and limited movement of the head. Klippel-Feil sequence is due to a defect in the early development of the spinal column in the neck, resulting in fusion of the cervical vertebrae. The condition is named for the French neurologists Maurice Klippel and Andre Feil who […]
- Disorder, specific developmental
Disorder, specific developmental: A disorder that selectively affects one area of development, sparing essentially all other areas of development. For example, dysgraphia is one type of specific developmental disorder. In dysgraphia there is inability to write legibly. Problems in dysgraphia may include fine-motor muscle control of the hands and/or processing difficulties. Sometimes occupational therapy is […]