Anyone can get melasma, but it is more common among young women. Melasma often appears during pregnancy, in the second or third trimesters. Doctors don't know exactly what causes melasma, but the condition is associated with the female hormones estrogen and progesterone.
A ribosome is made of numerous proteins and RNA. Function The Golgi complex takes proteins made by the endoplasmic reticulum and exports them out of the cell as needed. It is able to keep dangerous proteins from damaging the cell which made them. It is like a packaging department ready to deliver the protein products made in the cell.
From DNA to Protein Structure and Function: The nucleus of every cell contains chromosomes. These chromosomes are made of DNA molecules. Each DNA molecule consists of many genes. Each gene carries coded information for how to make one type of protein. Your body makes many different kinds of proteins. Every protein in your body has a specific shape.