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OpenI is the service of the National Library of Medicine that enables search and retrieval of abstracts and images (including charts, graphs, clinical images, etc.) from the open source literature, and biomedical image collections. Searching may be done by text queries as well as by query images. OpenI provides access to over 1.6 million images from about 580,000 PubMedCentral articles and 7,470 chest x-rays with 3,955 radiology reports.