As I was doing a reverse-image search online on a set of papers, I saw an unrelated photo of a skin biopsy that appeared to contain repetitive areas. Even in the small Google Image Search thumbnail it was clear to me that something unexpected was going on in this image.
The discovery led me to a set of 12 papers from a research group at the Hematopathology Department of the Texas MD Anderson Cancer Center, all with histopathology photos showing unexpected repetitive structures.
Science Integrity Digest 