Telomerase is an enzyme responsible for maintaining the length of telomeres, which are the protective caps on the ends of chromosomes. Telomerase is active in germ cells, stem cells, and some white blood cells but is generally inactive in most other human cell types after birth.

During human embryonic development, telomerase is active in the early stages to support rapid cell division and growth. It is not well-established at exactly what point after conception telomerase is switched off in human embryos, as this process may occur gradually and at different times in different cell types as the embryo develops.

However, it is known that telomerase activity decreases significantly as the embryo transitions into the fetal stage. The exact timing of this decrease might vary and further research is needed to pinpoint specific developmental stages for this process.
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