NP-40 lysis buffer
1 Sodium Chloride ---------------- 150 mM
2 NP-40 ----------------------- 1%
3 Tris, pH 8.0 ------------------ 50 mM
  NP-40 lysis buffer is one of the most commonly used lysis buffer. NP-40 is a nonionic detergent.
  Sometimes Triton X-100 can be used to replace NP-40.