Scientists have shown how the precursors of egg and sperm cells – the cells that are key to the preservation of a species – arise in the early embryo by studying pig embryos alongside human stem cells.
Saltwater crocodiles may help solve male infertility after a remarkable discovery that crocodile sperm, after leaving the testes, behave differently than previously thought.
Scientists in Spain on Wednesday they had created human sperm from skin cells, a medical feat which could eventually lead to a treatment for infertility.
Sperm that don't swim well rank high among the main causes of infertility. To give these cells a boost, women trying to conceive can turn to artificial insemination or other assisted reproduction techniques, but success can ...
A discovery by Rutgers scientists links a protein in sperm to the same molecule needed for reproduction in tiny roundworms and provides clues to human infertility.
In their arduous journey to the egg, sperm 'feel' the heat of the fallopian tube and 'taste' the chemical signals of the ova. But a new Weizmann Institute study published in Scientific Reports shows that sperm actually make ...
A tiny fruit fly has the bizarre distinction of possessing the longest sperm of any animal—20 times the length of its own body and 1,000 times that of human sperm.
A team of scientists in Sweden has broken open the genetic recipe for a human embryo's first three days of development, chronicling what happens in the crucial hours that follow the union of egg and sperm.
Men and women often enter relationships with different long-term goals. In the animal world, differences in approaches to reproductive success can lead to sexual conflict.
New research in flies shows how cells in adult reproductive organs maintain their sexual identity. The study, publishing online on November 13 in the Cell Press journal Developmental Cell, also identified a mutation that ...