Paraformaldehyde (4%)
0.1% Tween 20
Add 4 g of paraformaldehyde to 100 mL of 1X PBS(P) containing 0.1% Tween 20. Heat without boiling until the paraformaldehyde is completely dissolved. Dispense into 1-mL aliquots and store at −80ºC. Use fresh aliquots only.










