https://en.wikipedia.org/wiki/Nettie_Stevens#/media/File:Nettie_Stevens.jpg Day 347 has 8 protein-coding genes (browser view). It is the beginning of Chromosome Y.
The Y chromosome was discovered by Nettie Stevens, using beetles. She was one of the first American women recognized for her contributions to science. Today is home to SRY, the gene that is responsible for initiating male sex determination.
Click here to see all 8175344 letters of Day 347 with SRY underlined.