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. 2011 Nov 3;7:35. doi: 10.1186/1746-4811-7-35

Figure 2.

Figure 2

Optimization of sonication conditions to yield ~200-bp chromatin fragments. 2 × 107 cells of Chlamydomonas strains cw15-325 and CRR16 were sonicated 20 times 20 sec. DNA was extracted, separated on a 1.5% agarose gel and stained with Ethidium bromide.