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According to the diagram, step 3 indicates the S phase of cell cycle, which corresponds to the DNA replication phase.

Explanation:

In the S phase of the cell cycle the nucleus contains twice the amount of its genetic charge, due to increased DNA replication, resulting in each chromosome forming two chromatids.

This is a relatively long phase, and is part of the preparation process that occurs before an imminent division. In the diagram it is indicated by the number 3.

The S phase is named for the abbreviation of Synthesis.

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