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your on the right track, we collect the sera aka plasma from rats, rabbits and mice for our immunological experiments at work, the easiest way to do this is taking whole blood and spinning it out. ... We then get to screen it to see how its building its immunity, once it has the right ammount we harvest its spleen and then we fuse it with other cells and create a hybridoma, which then produces an specific antibody which is used to do a large number of things, depending on the antibody! we have some that attack cane toad cells making them toxic to them selve which is good! its also a good way trying to make vaccines for TB and stuff! One day we will have made one for cancer! but until that day we will keep trying! but I'm just rambling now!!!