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.

  • Pavlov conditioning

    The Russian physiologist Ivan Petrovich Pavlov (1848-1936) conditioned dogs to respond in what proved to be a predictable manner, for example, by first ringing a bell before feeding them and then simply ringing the bell upon which stimulus they would begin to salivate as if they were about to eat.

  • Muscle, abductor

    Any muscle used to pull a body part away from the midline of the body. For example, the abductor muscles of the legs spread the legs away from the midline and away from one another. The word “abductor” comes from the Latin prefix “ab-” meaning “away from” + “ducere” meaning “to draw or lead” = […]


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