Nikon has disqualified the winner of its Small World in Motion contest after discovering the video used generative AI, violating competition rules. The original first-place entry by Dr. Ning Xu claimed to depict cilia movement in a child's airway, but Nikon's review found it did not comply with AI usage guidelines. Dr. Xu admitted to using AI for post-processing in a LinkedIn comment, explaining it helped visualize features in reconstructed images. The video has been removed from Nikon's website, and a new winner has been announced. Nikon stated it plans to revise its rules and evaluation procedures for future contests to prevent similar issues. The decision emphasizes the importance of transparency in scientific competitions, especially with the growing use of AI in research.