This famously came up in cyclist Tyler Hamilton's 2005 suspension for doping, casting doubt upon the identification of his blood: http://www.nytimes.com/2005/0

This famously came up in cyclist Tyler Hamilton's 2005 suspension for doping, casting doubt upon the identification of his blood: http://www.nytimes.com/2005/05/10/health/10bloo.html?pagewanted=all&_r=0 http://www.nytimes.com/2005/05/10/health/10bloo.html?pagewan... It's been muddied over the years, Tyler has since said he never claimed to be chimeric.