Does not exhibit any ribonuclease activity.
Subcellular locations: Secreted
At the mRNA level, widely expressed . At protein level, restricted to epididymis . Expressed in spermatozoa (sperm head and neck), with higher levels on ejaculated and epididymal sperm than on testicular sperm (at protein level). Expressed in the epithelial cells of the epididymal tubule (at protein level). Not detected in muscle.