Thioredoxin domain-containing protein 3 (NME8)

Likely required during the final stages of sperm tail maturation from the testis or epididymis, where extensive disulfide bonding of fibrous sheath (FS) proteins happens. May be involved in the reduction of disulfide bonds within the semen FS components.

In vitro, it's neither NDP kinase nor reducing activity on disulfide bonds. .