Читать книгу Immunology - Richard Coico - Страница 84

The classical pathway was so named because it was the first complement pathway to be worked out. The component proteins are C1, C2, and so on, up to C9; the numbers designate the order in which the components were discovered, rather than their position in the activation sequence. Cleavage products are given lower case letters, such as C3a or C4b. Large fragments such as C3b and C4b can be cleaved further to yield products such as C3c, C3d, and so on.