The race to fertilize an egg is a ruthless one -- and now, scientists have shed more light on the punishing obstacle course attempted by hundreds of millions of sperm cells in their bid to get there first.
원문출처 : https://www.cnn.com/2019/02/14/health/sperm-cornell-study-scli-intl/index.html
원문출처 : https://www.cnn.com/2019/02/14/health/sperm-cornell-study-scli-intl/index.html