Paraffin-embedded sections were cut at 4 μm thickness, stained with hematoxylin and eosin (H & E), and examined by a pathologist blinded to the experimental groups. The extent of colitis was scored according to the protocols described previously [40 (link)]. Immunohistochemical analysis was performed as we described [20 (link)], using the following primary antibodies: anti-CD68, anti-MR (all from Abcam, Cambridge, UK), anti-CD31 and anti-MMP2 (Santa Cruz, Dallas, USA).
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