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May be involved in regulating the maturation of sperm head nuclei. Alternatively suggested to be a paternally delivered transcription factor that may function in early zygotic gene activation.
Predominantly expressed at high levels in testis with isoform 2 being the predominant isoform. Specifically expressed in postmeiotic spermatids and accumulates in the mid/late stage (at protein level). Ubiquitously expressed at low levels.