I use Abcam TUNEL Assay Kit - HRP-DAB (ab206386) on mouse tissues. The staining showed a pattern that I expected to see with a specific layer of cells dying due to drug treatment. But the staining was not normal, looked like it was crystalized. Can you suggest what step should be optimized to avoid this issue (my PI think it could be the tissues were left drying too long)?

Attached is the picture I got.

Thank you

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