Now, that blood will now contain the polyclonal antibodies against that antigen, against the two four Dinitrophenol. And now we can use the different types of purification techniques that we spoke about previously to basically isolate and study the polyclonal antibodies. For example, we can undergo self fractionation and differential centrifugation to basically isolate all the proteins from that blood mixture. And then we can use some type of purification technique. For example, we can use affinity chromatography, Angela Traffrees to basically isolate those polychrome antibodies and study them so we see that it's not that difficult to actually isolate and form these poly antibodies. Now, in the next lecture, we're going to discuss something called monoclonal antibodies and those are actually difficult to synthesize.