The Cell

What is in a cell?

The cell is defined in GO as all components within and including the plasma membrane and any external encapsulating structures, such as the cell wall and the cell envelope. intracellular ; GO:0005622 is defined as the contents of the cell excluding the plasma membrane and any structures outside the plasma membrane. For this reason, cell projection ; GO:0042995 is a direct child of cell ; GO:0005623; cell projection membrane ; GO:0031253 is part of cell projection ; GO:0042995 and plasma membrane ; GO:0005886.