Dear ALL;

      Recently, one of my colleagues cloned a gene (200aa) into pET30a vectors 
with either a N-ter or C-ter His6 tag. The correct reading frame was confirmed 
by sequencing. 

      However, it is weird that there was no protein expression either in the 
soluble fraction or as inclusion bodies.

      Could anyone give some instruction?

       Thanks a lot and have a nice weekend,

Jerry 
                                          

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