Klinefelter's Syndrome and Breast Cancer
Article examines the XXY male disorder, it symptoms, diagnosis, and treatment, and why these males are 20 to 50 times more likely to develop breast cancer than the average male. From the About.com Guide to Rare/Orphan Diseases.

Center for the Study of Autism: Fragile X
Concise information from a physician.

Klinefelter's Syndrome Association (UK)
Provides information, support, a reading list, and newsletter, with the focus on the UK and Ireland.

Klinefelter Syndrome Organization
Offers extensive links to support groups, conferences, email lists, research studies, and organizations.

National Fragile X Foundation
Offers comprehensive information with illustrations and links to resources.

FRAXA Research Foundation
Site provides information on the disorder, research news, books and product, and a family listserv.

NCBI: Fragile X
Brief information from a genetic perspective, from the National Center for Biotechnology Information (U.S.).

NICHD: Fragile X
Comprehensive information on all aspects of the disorder from the National Institute of Child Health & Human Development.

Sex Chromosome Variations: About 47XXY
Information from Klinefelter Syndrome and Associates organization.

Understanding Klinefelter Syndrome
Comprehensive information on all aspects of the disorder from the National Institute of Child Health and Human Development.

Woodbine House
Publisher offers a Parents' Guide for children with Fragile X.

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