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 synthesis is where RNA comes into a ribosome after copying DNA. There, the RNA's copy gets transformed into a protein when the specific order of amino acids is read. So, in short, ribosomes make all of the cell's proteins, which are needed to do everything in the cell. Ribosomes are first made in the nucleus, but they can be found on the Rough Endoplasmic Reticulum (Rough ER) and freely floating around in the cell's cytoplasm. Ribosomes work with every organelle in the cell due to their making of proteins, which are needed to build everything.