Kailei Sun is a postdoctoral fellow at Chinese University of Hong Kong, working under the guidance of Shannon Au, having completed his undergraduate studies at Fudan University. His research focuses on bacterial protein structures and functions, particularly large protein complexes in Helicobacter pylori. Experienced in using cryo-electron microscopy (cryo-EM) to solve protease structures in various conformations, he is currently exploring cryo-electron tomography (cryo-ET) to advance the understanding of macromolecular assemblies. By attending this course, he aims to further expand their knowledge and technical skills, contributing to the broader field of microbiology.