[18] 可追溯回……一本教科书：Nature, 21 June 2012, p. S2.
[19] 身体在肠道和喉咙里有跟嘴里一样的味觉受体：Roach, Gulp, p. 46.
[20] 也发现了味觉受体：New Scientist, 8 Aug. 2015, pp. 40-41.
[21]　含有一种叫作河豚毒素的毒药：Ashcroft, Life at the Extremes, p. 54; ‘Last Supper?', Guardian, 5 Aug. 2016.
[22]　英国作家尼古拉斯·埃文斯：‘I Wanted to Die. It Was So Grim', Daily Telegraph, 2 Aug. 2011.
[23]　我们有大约10,000个味觉受体：‘A Matter of Taste?', Chemistry World, Feb. 2017; Holmes, Flavor, p. 83; ‘Fire-Eaters', New Yorker, 4 Nov. 2013.