Swain S, Powell DA. 2001. Papaya Ringpot Virus-Resistant Papaya: A Case Study. Online. University of Guelph. Available at http://www.foodsafetynetwork.ca/gmo/papayarep.htm. Accessed October 10, 2002.
University of Reading. 2004. Genetically modified food case studies: Chymosin. Reading, UK: University of Reading, National Centre for Biotechnology Education. Online. Available at http://www.ncbe.reading.ac.uk/NCBE/GMFOOD/chymosin.html. Accessed January 3, 2004.
UPOV (International Convention for the Protection of New Varieties of Plants). 1961. International Convention for the Protection of New Varieties of Plants, adopted by the Diplomatic Conference on December 1, 1961. Online. Available at http://www.upov.int/en/publications/conventions/1961/content.htm. Accessed May 22, 2003.
USDA-AMS (U.S. Department of Agriculture-Agricultural Marketing Service). 2001. The National Organic Program. Washington, DC: U.S. Department of Agriculture-Agricultural Marketing Service. Online. Available at http://www.ams.usda.gov/nop/indexIE.htm. Accessed June 14, 2003.
Van Amburgh ME, Galton DM, Bauman DE, Everett RW. 1997. Management and economics of extended calving intervals with use of bST. Livest Prod Sci 50:15–28.
Wendt M, Bickhardt K, Herzog A, Fischer A, Martens H, Richter T. 2000. Porcine stress syndrome and PSE meat: Clinical symptoms, pathogenesis, etiology and animal rights aspects. Berl Munch Tierarztl Wochenschr 113:173–190.
WHO (World Health Organization). 2000. Safety Aspects of Genetically Modified Foods of Plant Origin. Report of a joint FAO/WHO Expert Consultation. Geneva: WHO.
Willadsen SM. 1989. Cloning of sheep and cow embryos. Genome 31:956–962.
Willadsen SM, Polge C. 1991. Attempts to produce monozygotic quadruplets in cattle by blastomere separation. Vet Rec 108:211–213.
Wilmut I, Schnieke AE, McWhir J, Kind AJ, Campbell KH. 1997. Viable offspring derived from fetal and adult mammalian cells. Nature 385:810–813.
Young LE, Sinclair KD, Wilmut I. 1998. Large offspring syndrome in cattle and sheep. Rev Reprod 3:155–163.
Zimnoch-Guzowska E, Marczewski W, Lebecka R, Flis B, Schafer-Pregl R, Salamini F, Gebhardt C. 2000. QTL analysis of new sources of resistance to Erwinia carotovora ssp. atroseptica in potato done by AFLP, RFLP, and resistance-gene-like markers. Crop Sci, 40:1156-1167.
Zitnak A, Johnston GR. 1970. Glycoalkaloid content of B5141-6 potatoes. Am Potato J, 47: 256-260