https://doctorstrizhak.com/benign-paroxysmal-positional-vertigo/ Day 321 has 56 protein-coding genes (browser view) including OTOP2 and OTOP3 (otopetrin 2 and 3).
The three otopetrin genes encode proteins that help to form otoliths, tiny stones/crystals that float in your inner ear to provide a sense of balance.
Click here to see all 8325744 letters of Day 321 with OTOP2 underlined.