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J SegmentAntibodies are created by the stochastic (random) splicing of three different gene sequences: a V Segment, a J Segment, and a D Segement. In this way, the immune system can create many different antibodies. Note that the joining of the V, J, and D segments is somewhat sloppy, resulting in even more mutations and variations in antibodies.Antibody, Antigen
Jonas SalkScientist who created a polio vaccine by culturing the virus on mono-layers of monkey kidney cells, treating the viruses briefly with formaldehyde which reacted with the amine groups of the nucleic acids, attenuating (disabling) the virus.Virus, Albert Sabin

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