PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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DIAGRAM: BRONCHUS: Asthma: Late phase of an asthma attack, low magnification; Arrows on Ciliated Epithelial Cells -- The late reaction begins approximately 6 hours after initial exposure to antigen and may last for several days. It is characterized by hyperreactivity of the airways, which results from underlying inf