http://anatomycorner.com/main/2016/01/12/eye-vitreous-humor/ Day 252 has 79 protein-coding genes (browser view) including COL2A1 (collagen, type II, alpha 1).
This collagen is a major component of the vitreous humor that fills your eyeball, and also your cartilage.
Click here to see all 8329707 letters of Day 252 with COL2A1 underlined.