## Problem 316 — rank:115

**Title:** Molecular mechanism of animal magnetoreception

**Added binding assumptions (LaTeX):**

```latex
A raw empirical distribution from finitely many angles has total variation one from a continuous density, so $p^{\rm obs}$ must mean the population law with an uncertainty-valid density estimate or a prespecified angular-bin law. Specify the receptor-state transition model and field/illumination histories. Predicting receptor sensitivity is different from showing that its signals cause orientation; that latter claim needs an identified transduction and behavioral comparison.
```

**Direct edits:** 0. **Fresh external checks:** None; supplied sources retained as provenance.