http://www.diazyme.com/cystatin-c-assay Day 334 has 52 protein-coding genes (browser view) including ten cystatin genes.
The cystatins are protease inhibitors – they are proteins that turn off the enzymes that break down other proteins. One cystatin, cystatin C, can be tested in blood as a marker of kidney failure.
Click here to see all 8055521 letters of Day 334 with CST3 (encoding cystatin C) underlined.