(sv40 vp1 pentamers that are unable to from capsids)(主语) were produced by omiting both the flexible N terminus and theC terminus arm (from the expression construct)状语
改成这样好理解:
(from the expression construct)状语, by omiting both the flexible N terminus and theC terminus arm ,(sv40 vp1 pentamers that are unable to from capsids)(主语) were produced。