homozygote wild type. We also found three polymorphic changes, previously reported in exon 1. The Asn-intoLys change is likely deleterious because it leads to a nonconservative amino acid substitution, changing a highly conserved residue. This mutation, located in the A-chain of the INSL3 protein, is the first mutation reported in this region. This finding provides new evidence that INSL3 is involved in testicular descent in humans; however, mutations of this gene are not a frequent cause of cryptorchidism.
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