 In mid November, the first learning tutorial was published, providing readers with a basic understanding of amino acid structure and function with an emphasis on cysteine and cystine.More tutorials were added covering the relevant topics of stone formation, stone prevention, and antibiotic use (for patients with recurring infections).The development of educational tutorials continued into early 2004, when the site became the online home of the newly incorporated Cystinuria Foundation of America (CysFA).