A demonstration by Dr. Barbara Meyer of how a branched genetic pathway can be affected by mutations in different parts of the pathway.
Time-lapse microscopy showing cell division from 1 to 2 to 4 cell stages in C. elegans with fluorescent chromosomes.
Video of the fertilization of the C. elegans oocyte, the fusion of the egg and sperm nuclei, and the egg laying.
A growth cone contacts a repellant molecule on another axon, collapses, and withdraws.
Video microscopy demonstrating how sperm from an infertile male can be injected into a female egg.
A mini-documentary discussing the remarkable regenerative capabilities of the planarian, and how HHMI researcher Alejandro Sánchez Alvarado uses them to study the biology of stem cells.
A reduction in the level of sonic hedgehog (SHH) gene expression can lead to cyclopia.
Video microscopy of sperm motility in an average human male and an infertile male.
Dr. Walsh is an HHMI investigator whose research focuses on understanding the genes involved in the development and function of the human brain.
Dante is a healthy 10-year-old boy who has had half his cerebral cortex surgically removed to treat his seizures.
Dr. Christopher Walsh discusses how genomic science has made enormous contributions to our understanding of the genetic causes of autism.
Dante is a 10-year-old boy born with hemimegalencephaly—an enlargement of half his brain.