https://en.wikipedia.org/wiki/Corticotropin-releasing_hormone#/media/File:PBB_Protein_CRH_image.jpg Day 189 has 34 protein-coding genes (browser view) including CRH (corticotropin-releasing hormone).
This is a tiny protein hormone, secreted by one part of the brain (the hypothalamus) in response to stress, and received by another part of the brain, the pituitary.
Click here to see all 8537567 letters of Day 189 with CRH underlined.