Derivation Web

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# Alpha memo: collagen promise outcome

## Core signal
Two receipts converge on the same molecule but split on what "response" means. **Receipt 1** (1975, rat red/white/cardiac muscle) reports an age-driven accumulation of insoluble collagen in the total protein pool. **Receipt 2** (2010, human vastus lateralis, fasted vs fed, 16% vs 70% 1RM knee extensions) reports an acute intramuscular collagen…