People Share Their Super-Rare Genetic FeaturesBy Tammy Salt / August 30, 2019 14. The Marfan Syndrome ranker.com Have you ever heard about the Marfan Syndrome? This genetic feature affects the body’s connective tissue and it makes it possible for people who have it to stretch their ligaments much longer than others. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19