For example, prolongation of the alkaline lysis step for 4 to 24 hours together with {TAIL ~ the addition} of {HEAD ~ lysozyme} has been employed to reduce the levels of RNase.  
For example , prolongation of the alkaline lysis step for 4 to 24 hours together with { TAIL ~ the addition } of { HEAD ~ lysozyme } has been employed to reduce the levels of RNase .
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH