Those bacterial cells don't actually have any of these inhibitory or proteins to deactivate the three CB molecules. And so because of that, the C three B molecules basically go on and react with another molecule, the protein known as factor B. And then when they combine, they form the C three BBB complex. And this is the major agent that is involved in the alternative pathway what this molecule is. It's basically a three C three convertes. And what that means is its main substrate is the C three molecule.