And  although the er, the causal relationship is not completely established, it is a very helpful way of remembering that one of the  principle distinguishing features of this organism which separates it from other members of the genus staphylococcus  it pr it produces this enzyme to coagulate things on  and the effects of this enzyme are illustrated here as against the control preparation, you see  a clot form due to the action of this enzyme on clotting practice which has been put into this  test tube serum.