1977, Edidin, M. H. Johnson,Immunobiology of Gametes, page183:
When this occurs are newnonacrosomal antigens becoming involved?
2013, E. S. E. Hafez, B. Hafez,Reproduction in Farm Animals:
The acrosome reaction is a prerequisite for fusion between ova and spermatozoa plasma membranes, and zona free ova cannot undergo fusion withnonacrosomal activated sperm even though attachment to the membrane surface occurs (Fig. 8-3).
2014, Charles B. Metz, Alberto Monroy,Fertilization, page350:
Even in spermatids of the cat and of man in which Burgos and Fawcett (1955) and Fawcett (1958) have shown that a fibrous perforatorium does not occur, it can nevertheless be seen in thin sections (Fawcett, 1958; Horstmann, 1961) that the homologous sites contain at least small amounts ofnonacrosomal substance.
