Some cells of the body like heart cells, neurons, etc., which do not divide, exit stage and enter of the cell cycle which is an inactive stage. The cells in this stage remain metabolically active but no longer proliferate unless called on to do so depending on the requirement of the organism. phase is the first growth phase on post-mitotic gap phase that lasts between the end of mitotic cycle and initiation of DNA replication. phase is the second growth phase or pre-mitotic gap phase in which cell prepares itself for cell division, i.e., mitosis. S-phase is the synthesis phase in which DNA replication occurs.

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