Alternately, residual RNA and chromosomal DNA can be reduced by ammonium sulfate precipitation following {HEAD ~ alkaline lysis}, precipitation, and {TAIL ~ clarification}.  
Alternately , residual RNA and chromosomal DNA can be reduced by ammonium sulfate precipitation following { HEAD ~ alkaline lysis } , precipitation , and { TAIL ~ clarification } .
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH