Fig. 1
From: Peptidoglycan in osteoarthritis synovial tissue is associated with joint inflammation
Detection of bacterial peptidoglycan (PG) in synovial tissue. Shown are representative sections of synovial tissue stained for PG by immunohistochemistry (see methods for details) obtained from (A) a patient with a periprosthetic joint infection (positive control), (B) a patient with a PG score of 2 (10–19 PG foci/10mm2), (C) a patient with a PG score of 3 (20–29 PG foci/10mm2), and (D) a patient with a PG score of 4 (30 + PG foci/10mm2). Enlarged insets show localization of PG foci (brown) within pockets of inflammation detectible by hematoxylin counterstain (blue)