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It is polysaccharides and other unknown sticky compounds. You can wash out with CTAB-free buffer (200mM Tris-HCL pH8.0, 50mM EDTA, 250mM NaCl).

1. Grind frozon tissue, add 1ml of CTAB-free buffer (cold) + 6 ul 2-mercaptoethanol.
2. Mix by inversion, keep 10 minutes on ice.
3. Spin at 10,000 g for 10minutes.
4. Discard the supernatant.
(If you use particularity nasty tissue, you can repeat this step.)

If it works, please give a upvote.
2Â¥2016-01-13 17:20:47
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