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is hydrocodone a barbiturate ROSI has been used as an assisted-reproduction technique to help infertile men whose testes cannot produce normal sperm, only spermatids. But fertility specitalists consider it an experimental procedure because of fears that immature round spermatids would contribute to the birth of genetically defective offspring. In particular, there has been concern that genetic processes such as imprinting ??? the switching on and off of genes that occurs in sperm cells before they come into contact with the egg ??? is incomplete in spermatids.