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Human Sperm Cells
- Infertility in Men - Sperm Abnormalities
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Varicocele
A varicocele is an abnormally enlarged and twisted (varicose) vein in the spermatic cord that connects to the testicle. Varicoceles are found in about 15% of all men and in about 40% of infertile men, although it is not clear how much they affect fertility or by what mechanisms. They can raise testicular temperature, which may have effects on sperm production, movement, and shape.
Age
Age-related sperm changes in men are not...
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From Our Experts
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From Our Sources
Stem cells used to make root cells of eggs, sperm
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Scientists create sperm from stem cells
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Heart Stem Cells Closer to Being Used in Humans
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Daily sex improves men's sperm quality: study
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Diet Linked to Sperm Abnormalities
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