https://en.wikipedia.org/wiki/Taste_receptor#/media/File:1402_The_Tongue.jpg Day 248 has 103 protein-coding genes (browser view) including a cluster of bitter taste receptor genes such as TAS2R13.
The taste receptor genes were first identified only 15 years ago, and they are still not fully understood.
Click here to see all 8329707 letters of Day 248