Consider single cell asexual bacteria. They consume materials that have the chemicals they need to
(1) fuel their energy needs (eat and excrete) and
(2) make more cellular molecules like the ones they have.
Some molecules could be used for {repairs\replacements}, and allow the cell to grow in size, but when they accumulate enough of the molecules to make a duplicate version, they split the resources between two new cells, either of which can have portions of the new and the old materials, and the process starts over.
The parent cell doesn't die, but the child cells have new materials in them. In that sense they would be rejuvinated. Usually talking about time periods measured in hours or days.
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