Australian Twin Registry
Includes a newsletter, registry for twins, study information and conferences.
Northern California Twin Registry
If you and your twin are over the age of 18, live in the Bay Area, and are interested in registering, you will be invited to participate in studies and be eligible to receive payme…
Sleep Research Study for Twins
The University of Pennsylvania is recruiting same-sex twins living in the eastern time zone who are between the ages of 25 and 59 to participate in a sleep research study.
The Center for Study of Multiple Birth
Recognized internationally as a unique resource for research and information about the causes, effects and problems of multifetal pregnancy.
Twin Research and Genetic Epidemiology
Located at St Thomas' Hospital, London, UK.
Twin Studies
From the Institute of Behavioral Genetics at the University of Colorado. A handful of studies for twins of all ages.
Twins Personality Survey
A twin survey on personality, conducted by researchers at Virginia Commonwealth University.