For Ages 18+
Did you or your twin already receive an invitation to join?
The invitation sent by email or snail mail contains the link to complete the questionnaire online. Please do not use this form, as we already have your information. If you lost the link and/or your ID number, please call the Twin Registry at 1.833.432.8720 or email us at ws.twinregistry@wsu.edu.
If you are already enrolled but received a letter about participating in a research study, please email us at ws.twinregistry@wsu.edu.
If you have not received an invitation and would like to join, please fill out the interest form below.