There are two peaks of killing activity of the splenic LAK cell supernatant before and after eleven day cell culture. The first peak was remarkably consistent with high BLT-esterase activity in the supernatant.

• 脾LAK细胞培养上清有前后两个杀伤活性高峰，以第11d为界，第一个活性高峰与上清中BLT酯酶活性呈正相关。