| species specificity | Restriction of a characteristic or response to the members of one species; it usually refers to that property of the immune response which differentiates one species from another on the basis of antigen recognition, but the concept is not limited to immunology and is used loosely at levels higher than the species. (12 Dec 1998) |
|---|---|
| specificity | The ability of the immune response to interact with individual antigens. (09 Oct 1997) |
| specificity constant | Ratio of the maximum velocity (Vmax) or kcat to the true Km value for a specific substrate in an enzyme-catalyzed reaction. (05 Mar 2000) |
| substrate specificity | A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts. (12 Dec 1998) |
| diagnostic specificity | The probability (P) that, given the absence of disease (D), a normal test result (T) excludes disease; i.e., P(T/D). (05 Mar 2000) |
| organ specificity | Restriction of a characteristic or response to a particular organ of the body; it usually refers to that property of the immune response which differentiates one organ from another on the basis of antigen recognition, but the concept is not limited to immunology. (12 Dec 1998) |