According to the amount that can be used up in one week, it should be packed into small branches and stored in the refrigerator at MINUS 20 or MINUS 30 degrees for at least several months.

If it is not frozen, you need to add preservatives if you want to keep it in the refrigerator at 4 degrees for a long time. For example, you can use 0. 1% NaN3 (sodium azide) depending on your purpose. Some experiments will be affected by preservatives.