UKPMC EvidenceFinder interface. The screenshot displays the results of entering the search term p53. Questions corresponding to the facts found in the UKPMC document collection that involve p53 are shown on the right-hand side of the screen. Beside each question is a number, which denotes the total number of documents containing the corresponding type of fact. The currently selected question, i.e., What induces p53 protein, is highlighted in green. On the left-hand side of the screen, the summary of each document retrieved by the search concludes with Extracts relevant to your question, which lists the sentence(s) within the document that contain facts relevant to the selected question. In each sentence, the answer to the question is highlighted in green, whilst the original search term, and the verb relevant to the question are emboldened. A Feedback link at the top of the age makes it easy for users to report problems or suggest new features.