Hello, all, I checked some data , which showed that Tween 20 could make bone sections flatten. But I am not sure of contrations(1%,2%,5%), time of incubation. If you have some experience in it , do you do me a favor? Thank you evey much! Guofeng Qian --------------------------------- Do You Yahoo!? ×¢²áÊÀ½çÒ»Á÷Æ·ÖʵÄÑÅ»¢Ãâ·ÑµçÓÊ