Reuse of laminin is not recommended as there will be changes in the sterility and concentration and structure of laminin. Diluted, unused laminin can be stored at 2 - 8 °C for up to 1 week. Laminin-coated plates can be stored at 2 - 8 °C for up to 4 weeks provided they are sealed well to prevent contamination and/or drying. Do not use the product if discoloration or web-like formations appear on the surface of the coated material.