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.
Main protein structures levels. Imagine proteins as machines; machines which make all living things, from viruses, bacteria, butterflies, jellyfish, plants and humans function. The human body is made up of approximately 100 trillion cells-each one has a specific function. Each cell has thousands of different proteins, which together make the cell do its job-the proteins are tiny machines within the cell.