40% Acrylamide Solution (for DNA sequencing)
1 Dissolve 380 g acrylamide (DNA-sequencing grade) and 20 g N,N-methylenebisacrylamide. 
2 Add 600 ml distilled water.
3 Heat to 37C to dissolve acrylamide. Adjust volume to 1 liter with distilled water.
4 Sterilize by filtration through a 0.45um filter.