浓度 >0.5 mg/ml 储存液 Lyophilized from 0.22 um filtered solution in PBS (pH=7.4) with 5 mM DTT. Normally 5% trehalose is added as protectant before Lyophilization. 保存条件 Stored at -70℃ or -20℃. Avoid repeated freeze/thaw cycles. 纯度 >95% as determined by Tris-Bis PAGE; >95% as determined by SEC-HPLC 内毒素 <1.0 EU/μg as determined by LAL 重组蛋白-表达系统 HEK293 cell