http://neuropathology-web.org/chapter10/chapter10gMiscellaneous.html Day 173 has 24 protein-coding genes (browser view) including ATP7A (ATPase copper transporting alpha.)
Like Day 37 (2p16.1-2p15): A copper-handling gene discovered using dogs and Day 76 (3q24-3q25.2): ceruloplasmin, a copper carrier, ATP7A is one of the genes we use to transport copper atoms into cells. Problems with ATP7A cause Menkes’ disorder, leading to a characteristic coarse and steely hair.
Click here to see all 8668938 letters of Day 173