http://www.sigmaaldrich.com/life-science/metabolomics/enzyme-explorer/learning-center/structural-proteins/mucin.html
Day 81 has 62 protein-coding genes (browser view) and marks the end of Chromosome 3. Day 81 includes the gene for mucin 4.
Mucins like mucin 4 provide a protective coating to the cells that line passages like the digestive and reproductive system. They are highly glycosylated proteins – coated in sugar groups that provide their slippery texture.
Click here to see all 8621546 letters of Day 81 with MUC4 underlined.