sperm
Image of the Day: The Long and Short of It
Image of the Day: The Long and Short of It
Sukanya Charuchandra | Aug 20, 2018
For flycatchers, the attractiveness of male birds is tied to the length of their sperm.
Researchers Develop Sperm-Robot Hybrids to Deliver Drugs, Assist Fertilization
Researchers Develop Sperm-Robot Hybrids to Deliver Drugs, Assist Fertilization
Diana Kwon | Apr 1, 2018
The artificially motorized cells may one day help fight cancers in the female reproductive tract.
Researchers Cryopreserve Coral Sperm
Researchers Cryopreserve Coral Sperm
Catherine Offord | Feb 1, 2018
A project aims to preserve samples of the climate change–vulnerable animals for future restoration.
Coral Sperm Banker
Coral Sperm Banker
The Scientist Staff | Jan 31, 2018
Mary Hagedorn is racing to save Earth’s coral reefs by developing techniques for freezing the colonial animals’ gametes.
New Techniques Detail Embryos’ First Hours and Days
New Techniques Detail Embryos’ First Hours and Days
Jef Akst | Dec 1, 2017
New technologies reveal the dynamic changes in mouse and human embryos during the first week after fertilization.
Infographic: How Embryos Take Control of Their Own Development
Infographic: How Embryos Take Control of Their Own Development
Jef Akst | Nov 30, 2017
The switch from maternal factors involves dynamic reprogramming of the zygotic genome.
Image of the Day: Sperm Protectors
Image of the Day: Sperm Protectors
The Scientist Staff | Aug 18, 2017
Among their many functions, macrophages in mouse testes guard sperm against attacks by other immune cells. 
Smartphone Semen Assay
Smartphone Semen Assay
Kerry Grens | Mar 23, 2017
An app-based sperm analyzer screens for signs of male infertility.
Promiscuous Mice Have Extra-Fast Sperm
Promiscuous Mice Have Extra-Fast Sperm
Jef Akst | Oct 19, 2016
The tails of polygamous deer mice sperm have longer midsections than the sperm tails of monogamous individuals of a similar species, and this correlates with improved swimming and competitive ability.
Study: Mitotic Cells Can Reprogram Mouse Sperm
Study: Mitotic Cells Can Reprogram Mouse Sperm
Ashley P. Taylor | Sep 13, 2016
Murine embryos undergoing first cell division can reprogram injected sperm and develop normally.