In {TAIL ~ order} to maximize {HEAD ~ the results interpretation}, the following precautions should be taken when using siRNAs: 
In { TAIL ~ order } to maximize { HEAD ~ the results interpretation } , the following precautions should be taken when using siRNAs :
OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH