A previously described peroxidase-based immunohistochemistry protocol was used to detect FHL2 expression in paraffin-embedded ovarian tissues [36 (link)]. Anti-FHL2 antibody (Proteintech, Wuhan, China) was used at 1:200. Subsequently, the sections were incubated with biotinylated secondary antibody (1:2000) (Boster Biotechnology, Wuhan, China) and avidin-biotin-peroxidase (Boster Biotechnology, Wuhan, China) before being exposed to diaminobenzidine (Servicebio, Wuhan, China, Wuhan, China) and counterstained with hematoxylin (Servicebio, Wuhan, China).
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