This image shows a brain slice of an embryonic mouse cerebral cortex. The caption best describes the image.

A Gene for Brain Size

Researchers discover a specific gene only found in humans, Neanderthals and Denisova-Humans which trigger brain stem cells to form a bigger pool of stem cells.
This image shows three strands of DNA.

New Clues to Causes of Birth Defects

Researchers report they believe they have found a possible clue as to why older mothers have higher risk of offspring with birth defects characterized by abnormal chromosome numbers.
This image shows a mouse embryo.

Evolving a Bigger Brain with Human DNA

Researchers have shown it is possible to pick out key changes in genetic code between humans and chimpanzees. They were then able to visualize the contributions to early brain development using mouse embryos.