Both of {HEAD ~ the siRNA} and shRNA can be delivered to the cells in {TAIL ~ any way} known or commonly used in the art 
Both of { HEAD ~ the siRNA } and shRNA can be delivered to the cells in { TAIL ~ any way } known or commonly used in the art
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH