https://www.rofalproject.com/2017/01/23/the-supernatant-was-blended-with-70-ml-of-17-w-v-polyethylene-glycol-6000-peg-and-157-m-nacl-that-contains-2-casamino-acids-to-precipitate-the-chromosomal-dna-for-the-selection-of-dna-related-p/