Recently on [social](https://twitter.com/schneiderleonid/status/1196361609943367680) media, news broke that [Xuetao Cao](http://www.xuetaocao.org/) duplicated or manipulated images in more than 50 papers of his. These accusations were brought to the public by Elisabeth Bik and explained in great details in following [article](https://forbetterscience.com/2019/11/18/the-teachings-of-chairman-cao/)

using social media and pubpeer website they notice duplication in images.
[![pubpeerimage](https://i.stack.imgur.com/SoT7K.png)](https://i.stack.imgur.com/SoT7K.png)
as someone who finished MSc in Immunology I can't understand what is wrong with images, they look credible to me, although there might be some software that can tell difference. How is possible that so many figures got duplicated and no-one from peer reviewers noticed? What is this scientific misconduct about? If it is really one after all.