7-Dehydrocholesterol down-regulates cholesterol biosynthesis in cultured Smith-Lemi-Opitz syndrome skin fibroblasts.

Biocytin is a classical neuroanatomical tracer commonly used to map brain connectivity. Biocytin is a conjugate of D-biotin and L-lysine, where the carboxylate of D-biotin is coupled with the ?-amine of L-lysine via a secondary amide bond.

2'-O-Methyladenosine, a methylated adenine residue is found in the urine of normals and adenosine deaminase deficient patients. It shows unique hypotensive activities.