The structure and specificity of a recombinant .alpha.2,3-sialyltransferase from Campylobacter spp., is disclosed. Also provided are methods for using the .alpha.2,3-sialyltransferase in the production of desired carbohydrate structures and nucleic acids that encode the sialyltransferase.

 
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> Anti-human T-cell costimulating polypeptide monoclonal antibodies

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