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Australian Twin Registry national registry of twin pairs who are willing to consider participating in health related research.
http://www.twins.org.au/
International Society aims to further research and public education in all fields related to twins.
http://www.ists.qimr.edu.au/
National Organization official site of the NOMOTC, a nonprofit, nation-wide support group for parents of twins.
http://www.nomotc.org/
Twins Days official home of the annual gathering of twins from around the world.
http://www.twinsdays.org/
