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But they could have offspring with the help of an advanced form of IVF, called round spermatid injection, which involves injecting genetic information from the early sperm into an egg.

Still, Ward said the success of spermatid injection seen in this work could support it as an option for overcoming infertility in men in the future.

Each spermatid becomes a functional spermatozoon or male gamete.

Figure 79 is a very young spermatid showing only diffuse chromatin in the nucleus.

Young spermatid, showing isolated large chromosome and rotation of nuclear contents.