Welcome to the website of IDEAS, a support and advocacy organization for duplications of chromosome 15q. These duplications most commonly occur in one of two forms which collectively can be grouped under the umbrella of the duplication 15q syndrome. These include an extra isodicentric 15 chromosome, abbreviated idic(15), or an interstitial duplication 15, int dup(15). If you are searching for information about duplications of chromosome 15q, you’ve come to the right place!