Fig. 1

Collection sites from Prince Youssef Palace located in Nag Hammadi, Qena, Egypt. (a): Prince Youssef Kamal Palace in the city of Nag Hammadi, north of Qena Governorate. (b): General view of the southern hall of Prince Yusuf Kamal Palace. (c): Sampling locations at the marble fountain in the courtyard of Prince Yusuf Kamal Palace. (d): The wooden stalactite in the southern hall of Prince Yusuf Kamal Palace, where microbial samples were collected. (e): A detailed picture of the location where microbial samples were collected from the wooden stalactite in the southern hall of Prince Yusuf Kamal Palace