Does somebody knows an antibody reference that would work in staining HLA-DR in human FFPE samples after a proteinse K pretreatment please ?

I need to stain HLA-DR cells before a RNA-based GeoMx experiment, which includes a mandatory proteinase K pretreatment and antigene retrieval using Tris-EDTA pH9. Clone LN3 failed, it seems... I am envisageing clone L243 or EPR3692... Dako says in a PDF that clone TAL 1B5 will fail with proteinase K, but no info for other clones...

Also I wonder if a polyclonal antibody could work better ?

Any idea, please ?

Best

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