Figure 1From: Basement membrane and vascular remodelling in smokers and chronic obstructive pulmonary disease: a cross-sectional studyRbm splitting. Splits within the lamina reticularis (Rbm) are indicated by black arrows. The dotted lines are examples of how we measured splits. The borders of the Rbm are marked by arrow-heads. (Collagen IV antibody staining, × 400).Back to article page