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.
Proteins are made inside cells. When a cell makes a protein it is called protein synthesis. The instructions for how to make a protein are held inside the DNA molecule. The two major stages in making a protein are called transcription and translation.he first step in making a protein is called transcription. This is when the cell makes a copy (or transcript) of the DNA. The copy of DNA is called RNA because it uses a different type of nucleic acid called ribonucleic acid.