Paterna Biosciences said it has mastered the molecular signals that teach stem cells how to mature into sperm for a promising new fertility treatment. More than one in eight American men between the ages of 25 and 49 experience some form of infertility today, according to the current data out of the U.S. Department of Health and Human Services. The problem, truly global in scope, has prompted milli... [4119 chars]
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