represents the 1950 invention of the pacemaker by John Alexander Hopps, the "father of Canadian biomedical engineering". The DNA strand is adapted from a computer-generated image created by the University of Ottawa; it honours the researchers who have contributed to the mapping of the human genome and is meant to evoke the future of medical innovation in Canada rather than its history. The image of the scientist was revised based on comments and details of the focus group study showing that some Canadians were concerned about the Asian appearance of the scientist as originally drawn. Some Canadians were concerned about a potential ethnic stereotype of Asians. For the Montreal focus group, "the inclusion of an Asian without representing any other ethnicities was seen to be contentious", whereas the Toronto focus group deemed it to "represent diversity or multiculturalism". One Vancouver focus group perceived the double helix of the DNA strand as anal beads, and others thought it was the Big Dipper. The banknote was unveiled and released into circulation at a national ceremony at the MaRS Discovery District in Toronto on 14 November 2011. The date was chosen because it was World Diabetes Day and the birthday of Frederick Banting. It was the first of the 2011 Frontier banknotes to be released because the same denomination in the 1986 Birds of Canada and 2001 Canadian Journey series had become "a favourite target of counterfeiters". By 2013, counterfeit versions of the banknote had been found in circulation in the Lower Mainland of British Columbia. It was nominated for International Bank Note Society Banknote of 2011 and was ultimately runner-up to the Kazakh 10,000 tenge banknote. Security The banknotes feature a large clear window through which passes a stripe of holographic metallic foil that changes colour based on angle. The holographic foil contains an image of one of the Parliament buildings at its base and a coloured duplicate of the portrait appearing on the banknote at the top. Both portions of the metallic foil contain the words "BANK OF CANADA", "BANQUE DU CANADA", and several repetitions of the value of the denomination appearing in different colours depending on the viewing angle. The metallic foil portrait is the same as the larger portrait on the banknote, but shifts colour when the banknote is tilted. The holographic foil is manufactured using a mix of aluminum, polyethylene terephthalate (PET), and adhesives. A frosted window in