When required a single Humira pre-filled pen may be stored at room temperature (below 25Â°C) for a maximum period of 14 days, but must be protected from light. Once removed from the refrigerator and stored at room temperature, the pen must be used within 14 days or discarded, even if it is returned to the refrigerator.
1 Cholesterol molecules are selectively dispersed between membrane phospholipids. 2  This helps to keep cell membranes from becoming stiff by preventing phospholipids from being too closely packed together. 3  Cholesterol is not found in the membranes of plant cells.
Some of these include a cell wall, a large vacuole, and plastids. Plastids, such as chloroplasts, assist in storing and harvesting needed substances for the plant. Animal cells also contain structures such as centrioles, lysosomes, and cilia and flagella that are not typically found in plant cells. Cell Wall-outer covering of the cell that protects the plant cell and gives it shape. 2  Chloroplast-the sites of photosynthesis in a plant cell. 3  They contain chlorophyll, a green pigment that absorbs energy from sunlight.