So what exactly happens once we form that antibody antigen complex to initiate the classical pathway? Well, as it turns out, the complement system actually consists of over 30 inactivated proteins that are found circulating in the bloodstream of our body. And these proteins are only activated when we actually form the antibody antigen complex. So the antigen antibody or the antibody antigen complex goes on and activates all these inactivated proteins found in our bloodstream, as we'll see in just a moment. And then those activated proteins go on and create a cascade of events, many different processes that eventually label those antigens for destruction and kill off those pathogenic agents that created those antigens in the first place. So to see exactly what we mean by that, let's discuss some of these proteins that are part of the classical pathway that are part of the complement system.