Abstract
The three antigens associated with adenovirus type 5 have been purified and investigated by electron microscopy and immunology. Antigen A is a round object 80 A in diameter. Antigen B has a round head 80 A in diameter attached to a tail 200 A long and 20 A wide with a 40 A knob on the end. Antigen C is like antigen B without its head. Trypsin digests the head of antigen B and converts antigen B to antigen C. Antigen A forms the 240 capsomers † on the adenovirus surface that have 6 nearest neighbours. The other 12 capsomers on the vertices are antigen B and have 5 nearest neighbours. The tail on each antigen B extends outwards from the virus surface. Antigen C exists in the virion only as part of antigen B.
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