JavaScript code can be imbedded in HTML pages and interpreted by the Web browser (or client). JavaScript can also be run at the server as in Microsoft's Active Server Pages before the page is sent to the requestor. Both Microsoft and Netscape browsers support JavaScript, but sometimes in slightly different ways.
Klinefelter syndrome was first described in 1942 by Dr. Harry Klinefelter, an endocrinologist at Massachusetts General Hospital. He published a case study of nine adult men with a common set of symptoms involving hypogonadism. At the time, chromosomes had not yet been discovered.
That occurred in 1956, when scientists confirmed that humans typically have 23 pairs of chromosomes, including two sex chromosomes. In 1959, a young English researcher, Patricia Jacobs, identified an extra X chromosome as the genetic marker for Klinefelter syndrome, and gave it the genetic signature of 47,XXY.