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.
The primary structure of a protein is encoded in your DNA. In order to make a protein, you must first make a copy of the DNA through transcription. This process happens in the nucleus. In the cytoplasm, ribosomes will interact with the transcript and create a protein (polypeptide) from individual amino acids.