Klinefelter's syndrome is a genetic condition affecting boys and men that occurs as a result of the presence of one or more extra X chromosomes. The condition is characterised by tall stature, reduced fertility and development of breast tissue.
Kisspeptins are a family of proteins that are essential for fertility. The first gene member of the family was discovered in 1996 by a group working in Hershey, Pennsylvania. It is named after the city's chocolate 'Kisses', which are made in Hershey.
The kidneys are specialised organs that ensure that unwanted substances and excess water are removed from the bloodstream.