Australian scientists have discovered the chemical signals that ensure men produce sperm instead of eggs. Dr Josephine Bowles and Professor Peter Koopman from UQ's Institute for Molecular Bioscience led a team that found that a protein called FGF9 promotes the production of sperm in males while suppressing the development of eggs. "It sounds obvious, that men produce sperm and women produce eggs," Dr Bowles said. "But sperm and eggs start out as identical cells, and it's only through a complex process of signals that these cells end up as sperm in men and eggs in women...
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