Diagram showing on the upper part a condition with antibodies and on the lower part a condition without antibodies. Antibodies are depicted as Y-shaped structures and touch antigen represented with red star-shaped forms. On the right of the graph for each condition is represented the distribution of the B cell repertoires over time, entitled "Repertoire". Each B cell clone is represented as a plain circle with a different color. An arrow is located underneath and represents time going from left to right. Each condition is segregated with a grid layout. The condition with antibody displays a uniform distribution of the different colors of B cells. The condition without antibody shows an accumulation of circles with the same color over time.