The sperm, created by exposing stem cells to "a special cocktail of growth factors, nutrients and retinoic acid, a derivative of vitamin A," have a head and tail, a special combination of proteins needed for fertilization, 23 chromosomes, and the ability to swim — just like ordinary, ball-produced sperm. However, sperm biologist Allan Pacey (who obviously got his job by losing a game of MASH) is skeptical. He says,
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