{HEAD ~ The ribozymes} of {TAIL ~ the invention} are easily modified to alter their sequence specificity 
of
{ HEAD ~ The ribozymes } of { TAIL ~ the invention } are easily modified to alter their sequence specificity
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH