Description  Claims  Cited references 

US5843780A   [0002] 
US5453357A   [0007]  [0014] 
US5670372A   [0007] 
US5690296A   [0007] 
WO9830679A   [0008]  [0031] 
WO9920741A   [0009] 
US5405772A   [0010] 

Science   [0002]  [0025] 
Nature Biotechnology   [0005] 
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J. Biol. Chem.   [0014] 
Dev. Biol.   [0018] 
J. Imm. Methods   [0047]