For the first time in the world scientists have succeeded in developing human embryonic stem cells (hESCs) from a single cell, or blastomere, of a 4-cell stage embryo, the 24th annual conference of the European Society of Human Reproduction and Embryology heard today (Wednesday 9 July).

Massachusetts General Hospital (MGH) clinical researchers, in collaboration with basic scientists from the University of California, Irvine (UC Irvine) have identified a new molecular pathway required for normal development of the reproductive, olfactory and circadian systems in both humans and mice.

Men who have lower-pitched voices have more children than do men with high-pitched voices, researchers have found. And their study suggests that for reproductive-minded women, mate selection favours men with low-pitched voices.

Many scientists assume people have sex for simple and straightforward reasons such as to experience sexual pleasure or to reproduce, but new research at The University of Texas at Austin reveals hundreds of varied and complex motivations that range from the spiritual to the vengeful.

The more complex the assisted reproduction procedure, the more likely the umbilical cord develops in an atypical place or have other abnormalities, a scientist told the 23rd annual conference of the European Society of Human Reproduction and Embryology.

A study of women’s moods during IVF has found a strong relationship between negative mood and multiple embryo transfer, a scientist told the 23rd annual conference of the European Society of Human Reproduction and Embryology (Tuesday 3 July).

In its early and most critical stages, human reproduction requires precise, vital functions. The role of one sperm-delivered protein, which is crucial to the process, is being closely observed by scientists from the United States and Canada. Lab tests in recent years have produced valuable information and hopes of regulating that protein to enhance fertility.