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Generating sufficient diversity is a problem because the human body only makes on the order of 106 different proteins , which the immune system must use to construct receptors that can recognize potentially 1016 different proteins or patterns . The young mind reels with the possibilities of what adults do once the lights go out . The number of receptors that bind to pathogens will determine the affinity that the lymphocyte has for a given pathogen . Results of the competition will be announced individually to participants in advance of KDD ; public announcement of results will be during the opening ceremony of KDD . This combinatorial explosion allows the immune system to make potentially 1015 different kinds of receptors , although the actual number of distinct receptors present in the body at any given time is far less than this . From pioneer girls to future astronauts , each has a unique story to tell . A lymphocyte has approximately 100 000 receptors on its surface , but because all of these receptors have the same struture ( a lymphocyte is monoclonal ) , a single lymphocyte can only bind to structurally related epitopes . As an activist herself , Rosen is particularly adept at capturing the passion that motivated many participants in the movement . See Roger Maris hit 61 homers , a mark they said would surely never be surpassed . Estimates place the number at between 108 and 1012 distinct receptors present at one instance .