C4

1. command, control, communications and computers - командование, управление, связь и вычислительная техника;

2. С4 system - система командования, управления, связи и вычислительной техники

C4: translation

Fourth component of complement, although the third to be activated in the classical pathway. Becomes activated by cleavage (by C1) to C4b, which complexes with C2a to act as a C3 convertase, generating C3a and C3b. The C4b2a3b complex acts on C5 to continue the cascade.

C4: translation