The miR‐31 in situ hybridisation assay was performed as described.
23 (link) Tumours embedded in OCT (#4583; SAKURA) were cut into 10 µm slices. Digoxigenin‐labelled LNA probes mmu‐miR‐31 (#39153; Exiqon) were used following the manufacturer's protocol. Both digoxigenin‐labelled miR‐31 and scrambled probes were hybridised at 55°C overnight in a humidified chamber. The signals were detected by staining with anti‐digoxigenin‐AP antibody (#110932374910; Roche) and finally developed with BM purple substrate (#11442074001; Roche).
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