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The protein encoded by this gene contains a classical signature of the insulin superfamily and is significantly similar to relaxin and relaxin-like factor. This gene is preferentially expressed in testis. Its expression in testis is restricted to interstitial cells surrounding seminiferous tubules, which suggests a role in sperm development and fertilization.
insulin-like peptide 5
, insulin-like peptide 6
, insulin-like peptide INSL6
, relaxin/insulin-like factor 1