Each antibody is pretty specific. The immune system makes lots of different ones, even in response to a single foreign protein. The goal here is probably more

Each antibody is pretty specific. The immune system makes lots of different ones, even in response to a single foreign protein. The goal here is probably more characterization than discovery. For instance, here's a higher up Google result for "antibody heterogeneity" published in 1966: https://www.karger.com/Article/Pdf/209100 https://www.karger.com/Article/Pdf/209100