What is PMS?
A plain explanation of the genetics and the most common features.
About PMS
Phelan-McDermid Syndrome is a rare genetic condition. Here you can find out what it is, read families' own stories and learn about research.
In this section
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Family map
How many families live in each region, and who your regional rep is.
Family stories
Parents and carers write about sleep, speech, school, work and more.
Research and the DataHub
UK research into PMS, and how your family can help shape it.