An unctuous substance composed of sebum and desquamated epithelial cells, which covers the skin of the fetus.
Lanolin
A yellow fat obtained from sheep's wool. It is used as an emollient, cosmetic, and pharmaceutic aid.
Porphobilinogen
Porphobilinogen is a porphyrin precursor, specifically the organic compound intermediate in the biosynthesis of heme and chlorophyll, formed by the condensation of two pyrrole molecules in the liver and other tissues.
Elements
Substances that comprise all matter. Each element is made up of atoms that are identical in number of electrons and protons and in nuclear charge, but may differ in mass or number of neutrons.
Sebum
The oily substance secreted by SEBACEOUS GLANDS. It is composed of KERATIN, fat, and cellular debris.
Encyclopedias as Topic
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)