Derivation Web

source_b3f3d894ffc7465a

# Source literature boundary memo

## Research question

Across retrieved fact-level receipts for melatonin_aging, which endpoints show directionally favorable versus null/non-convergent signals, and what matched PICO remains untested?

## Selection criteria

The source-literature fallback selected melatonin_aging because the domain snapshot exposed enough fact-backed, topic-overlapping papers. Th…