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A short-fuse version of IGF-1. Acts fast, acts local, then clocks out. Studied for site-specific tissue research.

The repair memo muscle releases right after it gets damaged, a "send help here." Studied for localized tissue research.

Acts like a bouncer for myostatin, the protein that tells muscle "that's enough." Studied for taking the brakes off.

IGF-1 with a backstage pass. Dodges the proteins that usually retire it early, so it stays active far longer.