It may be significant, however, that in both acro- somes the mass of presumably lytic material lo- cated in the lumen of the acrosomal vesicle ("acrosomal granule" in Hydroide$, "axial strand" Mytilus) is found in close contact with the inside of the acrosomal membrane in the apical region where a trigger mechanism might be expected to operate (2, 4, 12).
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THE ACROSOME REACTION IN MYTILUS EDULIS. I. FINE STRUCTURE OF THE INTACT ACROSOME.
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