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Story summary
- San Francisco 49ers fans and some players call for relocating the team's practice facility due to a theory linking injuries to a nearby electrical substation.
- George Kittle, a San Francisco 49ers star tight end, suffered a torn Achilles.
- The team has practiced at the same facility since 1988.
- Medical experts largely dismiss the low-frequency electromagnetic fields theory.
- Some players and agents say relocation could help retain talent.
