Fig. 1. An individualizing cyst. Individualization takes place at the cystic bulge. The membrane reorganization occurs as the actin cone (red triangle) moves down along the sperm axoneme from its head to the end of the tail. Arrow indicates the direction of movement. Cytoplasm and membranous organelles are squeezed out and accumulate in the cystic bulge as the actin cones move down the cyst. At the end of individualization all cytoplasm and organelles are discarded as a waste bag and 64 thin individual sperm are formed.