http://iheartguts.com/blogs/meet-the-guts/14652313-inner-ear-now-hear-this Day 217 has 50 protein-coding genes (browser view) including OTOG (otogelin).
Otogelin was discovered in 1997 and is a secretion only expressed in the inner ear.
Click here to see all 8442914 letters of Day 217 with OTOG underlined.