The causes of embryonic arrest during pre-implantation development are poorly understood. Attempts to correlate patterns of oocyte gene expression with successful embryo development have been hampered ...

Single-embryo transfer has been recommended to reduce the incidence of multiple gestations when in vitro fertilization is performed in women under 36 years of age. We designed a prospective, ...

Much like guided missiles that sense the heat of a plane's engine, sperm are guided to the fertilization site by temperature, reports a Weizmann Institute study published in the current issue of ...

"Chimeras are the result of fusion of two zygotes to form a single embryo, producing an individual with genetically different kinds of tissue. If the fused zygotes are of different sex, the individual ...

Who hasn't seen it before: the view through the microscope in which a sperm penetrates an egg cell and fertilises it. This fundamental step in procreation happens dynamically and seemingly without ...

What Is In Vitro Fertilization? In vitro fertilization (IVF) is a type of fertility treatment. IVF involves taking eggs removed from the ovaries, fertilizing them with sperm to create an embryo, and ...

New study finds microgravity disrupts sperm and embryo development, raising concerns about human reproduction in space.

An international team of scientists has for the first time mapped all the genes that are activated in the first few days of a fertilised human egg. Led by Sweden's Karolinska Institutet, the ...