Researchers have discovered that a reinforcing outer-layer which coats the tails of human sperm is what gives them the strength to make the powerful rhythmic strokes needed to break through the cervical mucus barrier.
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/03/190320102014.htm
from Top Technology News -- ScienceDaily https://www.sciencedaily.com/releases/2019/03/190320102014.htm
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