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Gross view (A–D), H&E (E–H), F4/80 (I–L), and TNF-α (M–P) stainings of tissue sections of the repaired flexor digitorum profundus (FDP) tendons of the untreated control group and the experimental groups treated with Seprafilm®, HAFB, and HAIFB 3 weeks post-operation. Bar = 100 μm. T: tendon; S: suture; M: membrane; black arrows: sites where adhesion occurred.
