Functions during spermatogenesis as a chaperone for a range of client proteins that are important for sperm adhesion onto the egg zona pellucida and for subsequent penetration of the zona pellucida. Required for normal sperm migration from the uterus into the oviduct. Required for normal male fertility. Binds calcium ions (By similarity).
Endoplasmic reticulum membrane; Single-pass type I membrane protein.
Detected in testis (at protein level). Detected in testis.
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