I'm trying to sonicate chromatin from Raw cells (mouse monocytes) that were fixated with 1% formaldehyde. I'm following the Covaris TruChIP protocol for shearing and either get no shearing or shearing with fragments size of ~500 bp.

My parameters:

duty cycle: 5 / 10%

cycles per burst: 175/200

peak incident: 104 watt

time: 3/4/6/8/ min.

I've tried combinations of all the above parameters.

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