And each one of these different classes of antibodies functions in its own way to basically defend our body from these pathogenic invasions. So let's very quickly look at some major distinctions between these five classes. So let's begin with IgG immunoglobulin g. So immunoglobulin g is actually the most common type of antibody that is found inside our blood. In fact, 75% of the antibodies found inside our blood are the immunoglobulin g types. So what these antibodies do is basically what we described earlier. This was an example of the immunoglobulin g. They basically float around, they swim around our blood and lymph and they locate those special types of antigens found on our pathogens.