Insulin like 6 is a protein that in humans is encoded by the INSL6 gene.
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Function
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.
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Further reading
This article incorporates text from the United States National Library of Medicine, which is in the public domain.