Researchers have found that some cells form new multicellular structures with functions that defy their original biological ...

Scientists from Germany and Italy have uncovered details of the protective layer that surrounds the fine protrusions of cells. Biological cells often possess thin, hair-like protrusions on their ...

If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust. Regular smokers can also blow out darker mucus because of the tar or other toxic ...