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.
Protein serves both structural and functional roles in the human body. Different types of protein are involved in building up the structure of the human body eg. Actin and myoâ¦sin ( two proteins ) make muscle cells, keratin makes hair, etc. Proteins serve structural roles by being a component of the cells.