The Secretary of State for Defence

Andrew William Topping

Richard William Titball

Ethel Diane Williamson

Julie Miller

Leslie William James Baillie

Helen Claire Flick-Smith

Nicola Jane Walker

Helen Lisa Bullifent

Paula Thomson Holden

An immunogenic reagent which produces an immune response which is protective against, said reagent comprising one or more polypeptides which together represent up to three domains of the full length Protective Antigen (PA) ofor variants of these, and at least one of said domains comprises domain 1 or domain 4 of PA or a variant thereof. The polypeptides of the immunogenic reagent as well as full length PA are produced by expression from. High yields of polypeptide are obtained using this method. Cells, vectors and nucleic acids used in the method are also described and claimed.

Expression system

An immunogenic reagent which produces an immune response which is protective againstsaid reagent comprising one or more polypeptides which together represent up to three domains of the full length Protective Antigen (PA) ofor variants of these, and at least one of said domains comprises domain 1 or domain 4 of PA or a variant thereof. The polypeptides of the immunogenic reagent as well as full length PA are produced by expression fromHigh yields of polypeptide are obtained using this method. Cells, vectors and nucleic acids used in the method are also described and claimed.

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North Yorkshire, United Kingdom

Andrew William Topping