Figure 1.

Dot plots from majority of controls lacking circulating fibrocytes (a). Majority of idiopathic pulmonary fibrosis patients and some controls harboring circulating fibrocytes, with cells staining positively with anti-CD45 antibody (b). The horizontal and vertical cursors were set on the isotype control antibodies for quadrant analysis (c). The R1gated cell population identified as fibrocytes based on the coexpression of CD34 and collagen-1 (d). No staining for CD34/collagen-1 antibodies was detected (e). All CD45⁺ cells clearly revealed a well-defined fibrocyte population (f)