Assertion: mitosis's stage | /r/HasProperty | initiation
Facets:
Source sentences:
text: It is possible to define cytokinesis in terms of discrete phases, since the process, like mitosis, may be divided into four stages: initiation, when the outside of the cell begins to pucker inward; contraction, which is powered by proteins similar to those found in muscle; membrane insertion, when a cytoplasm is placed around the two almost-separated daughter cells; and completion, when cleavage is complete.