Abstract
Aggregation of human blood platelets induced by ADP was strongly inhibited by 2-azidoadenosine, a photolysable analogue of adenosine. The deamination of adenosine by adenosine deaminase (E.C. 3.5.4.4) was competitively inhibited by 2-azidoadenosine. In the presence of 2-azidoadenosine the enzyme was inactivated by u.v. radiation. The inactivation was diminished in the presence of a protein scavanger.

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