Women’s Cervical Mucus Prefers Some Sperm Over Others 
Women’s Cervical Mucus Prefers Some Sperm Over Others 
In human male-female pairs with a less similar suite of genes for human leukocyte antigens, sperm fare better when exposed to cervical mucus.
Women’s Cervical Mucus Prefers Some Sperm Over Others 
Women’s Cervical Mucus Prefers Some Sperm Over Others 

In human male-female pairs with a less similar suite of genes for human leukocyte antigens, sperm fare better when exposed to cervical mucus.

In human male-female pairs with a less similar suite of genes for human leukocyte antigens, sperm fare better when exposed to cervical mucus.

egg
Single-Cell Analysis of Ovarian Cortex Fails to Find Stem Cells
Single-Cell Analysis of Ovarian Cortex Fails to Find Stem Cells
Amy Schleunes | Mar 6, 2020
The controversial oogonial stem cells eluded a team of Swedish researchers who mapped high-quality tissue samples of the human ovary, prompting more questions about the cells’ existence.  
Aneuploidy Could Explain Variability in Female Fertility: Study
Aneuploidy Could Explain Variability in Female Fertility: Study
Catherine Offord | Jan 13, 2020
Eggs from girls and from older women show higher rates of errors in chromosome number.
Image of the Day: Self-Insemination
Image of the Day: Self-Insemination
Carolyn Wilke | Feb 1, 2019
Videos reveal how a female squid fertilizes her eggs—one at a time and without spilling much stored sperm.
Image of the Day: Eggshell Edifice
Image of the Day: Eggshell Edifice
The Scientist Staff, The Scientist Staff | Apr 6, 2018
A new 3-D model plumbs the molecular intricacies of eggshell composition.
Researchers Cryopreserve Coral Sperm
Researchers Cryopreserve Coral Sperm
Catherine Offord | Jan 31, 2018
A project aims to preserve samples of the climate change–vulnerable animals for future restoration.
Long Egg Incubations May Have Doomed the Dinosaurs
Long Egg Incubations May Have Doomed the Dinosaurs
Diana Kwon | Jan 4, 2017
An investigation of fossilized teeth reveals that some dinosaurs took more than six months to hatch, hindering their abilities to procreate quickly and efficiently.
A Scrambled Mess
A Scrambled Mess
Karen Schindler | Apr 30, 2016
Why do so many human eggs have the wrong number of chromosomes?
Haploid Stem Cells Created
Haploid Stem Cells Created
Catherine Offord | Mar 18, 2016
A method that forces human eggs to divide can produce embryonic stem cells capable of division and differentiation with only one copy of each gene.
Call for Germline Editing Moratorium
Call for Germline Editing Moratorium
Jef Akst | Mar 13, 2015
In response to speculation that groups have edited the DNA of human embryos, researchers request that gene editing of human reproductive cells be halted.