Which year are you in? http://www.purplecreativedesign.co.uk/stmap_58840.html?avigra.viagra.lamictal omega sports strive  He starts with stem cells extracted from cow muscle tissue. In the laboratory, these are cultured with nutrients and growth-promoting chemicals to help them develop and multiply. Three weeks later, there are more than a million stem cells, which are put into smaller dishes where they coalesce into small strips of muscle about a centimetre long and a few millimetres thick.