Specificities

... actively seek to invade the thymus and try to present their own antigens as "self", but I guess even if this happened, the overlapping specificities of TCRs should be able to handle the situation.

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... types of antibodies. These genes also have mechanisms of recombination and hypermutation, which further increase the number of different antibody specificities to hundreds of thousands, if not millions. The body produces B cells of which each produces a unique type of antibody initially. There ...

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... DNA backbone. Deoxyribonucleases are thus one type of nuclease. A wide variety of deoxyribonucleases are known, which differ in their substrate specificities, chemical mechanisms, and biological functions.

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... genes of members of the Neocallimastigales and used in a nested PCR protocol to amplify 787-bp fragments of DNA from landfill site samples. The specificities of the primers were confirmed by phylogenetic analysis of the environmental clone sequences, and this method can therefore now be used ...

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... pretty much sums it all up. > http://en.wikipedia.org/wiki/Gas_exchange < Hope you can figure it out from there. Feel free to bring up any specificities that are unclear.

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