Day 303 (16p13.2-16p13.11): protamines, packaging DNA tightly in sperm heads


Day 303 has 61 protein-coding genes (browser view) including PRM1 and PRM2 (protamine 1 and protamine 2).

DNA is usually packed into the nucleus by wrapping around histones, but in sperm the protamines are special proteins used to pack the DNA even tighter.

Click here to see all 8212577 letters of Day 303 with PRM1 underlined.

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